1. physics

    An axon is the relatively long tail-like part of a neuron, or nerve cell. The outer surface of the axon membrane is charged positively, and the inner surface is charged negatively. The membrane itself has a dielectric constant k ~ 5 and a thickness d ~

    asked by edd on February 11, 2010
  2. Physics

    The speed of propagation of the action potential (an electrical signal) in a nerve cell depends (inversely) on the diameter of the axon (nerve fiber). If the nerve cell connecting the spinal cord to your feet is 0.97 m long, and the nerve impulse speed is

    asked by Bec on January 18, 2016
  3. biology/ help please

    which part of a neuron in the cerebellum of the brain is the most extensive in terms of anatomical developement? a-hillock region b-cell body c-dendrites d-nucleus e-axon -my answer is axon

    asked by joy on April 8, 2013
  4. biology/ help please

    which part of a neuron in the cerebellum of the brain is the most extensive in terms of anatomical developement? a-hillock region b-cell body c-dendrites d-nucleus e-axon -my answer is axon

    asked by joy on April 9, 2013
  5. science

    What part of a nerve cell receive the nerve impulse? Dendrite, Synapse or the Axon?

    asked by scicenemaster21212 on February 2, 2015
  6. ap biology

    10 . Which one of the following statements is NOT true about the resting potential? (28.3) [Hint] A. The neuron's plasma membrane is much more permeable to potassium than to sodium. B. The concentration of sodium is much higher inside the cell than

    asked by carol on November 6, 2008
  7. biology

    When an impulse moves down the axon, a. sodium ions first rush out of the cell. b. a small part of the axon momentarily reverses its polarity. c. the resting potential of the cell does not change. d. potassium ions are pumped into the axon. B?

    asked by Lily on November 30, 2010
  8. Science help.

    1. The ___ is the outer, thinnest layer of your skin, which houses sweat pores. (1 point) epidermis dermis fatty layer hair 2. One of the purposes of sweat glands is to release waste products, such as water and _____. (1 point) blood dirt sugar salt 3.

    asked by Someone on March 14, 2013
  9. Check + biology

    The following statement describes, in random order, events during the transmission of a nerve impulse. Use them to answer the next \g question(s). Event 1: Positive ions flow into the neuron. Event 2: The resting potential of the cell membrane is restored.

    asked by Anonymous on February 21, 2007
  10. Neuroscience

    A neuron has: 1. a single cell body or soma 2. one or two cell bodies or somata 3. its nucleus in the axon 4. none of the above

    asked by qwerty on November 25, 2014
  11. Bio + check!!

    The following statement describes, in random order, events during the transmission of a nerve impulse. Use them to answer the next \g question(s). Event 1: Positive ions flow into the neuron. Event 2: The resting potential of the cell membrane is restored.

    asked by Anonymous on February 22, 2007
  12. Bio _

    The following statement describes, in random order, events during the transmission of a nerve impulse. Use them to answer the next \g question(s). Event 1: Positive ions flow into the neuron. Event 2: The resting potential of the cell membrane is restored.

    asked by Anonymous on February 21, 2007
  13. Bio+ chcekc!

    The following statement describes, in random order, events during the transmission of a nerve impulse. Use them to answer the next \g question(s). Event 1: Positive ions flow into the neuron. Event 2: The resting potential of the cell membrane is restored.

    asked by Anonymous on February 21, 2007
  14. check+ please!

    The following statement describes, in random order, events during the transmission of a nerve impulse. Use them to answer the next \g question(s). Event 1: Positive ions flow into the neuron. Event 2: The resting potential of the cell membrane is restored.

    asked by Anonymous on February 22, 2007
  15. check!

    The following statement describes, in random order, events during the transmission of a nerve impulse. Use them to answer the next \g question(s). Event 1: Positive ions flow into the neuron. Event 2: The resting potential of the cell membrane is restored.

    asked by Anonymous on February 22, 2007
  16. check!

    Posted by Anonymous on Thursday, February 22, 2007 at 12:20pm. The following statement describes, in random order, events during the transmission of a nerve impulse. Use them to answer the next \g question(s). Event 1: Positive ions flow into the neuron.

    asked by Anonymous on February 22, 2007
  17. Health part 2

    The three basic parts of a neuron include ________. A. Soma, dendrites, axon B. Dendrites, cell body, neurotransmitters C. Axon, dendrites, neurotransmitters D. None of the above

    asked by Carlos on November 6, 2013
  18. PLEASE CHECK!!! THIS MY MY 20TH TIME POSTING!!!!

    The following statement describes, in random order, events during the transmission of a nerve impulse. Use them to answer the next \g question(s). Event 1: Positive ions flow into the neuron. Event 2: The resting potential of the cell membrane is restored.

    asked by bob! on February 23, 2007
  19. Neuroscience

    The longest neurite of a neuron is typically a: 1. cell body 2. dendrite 3. axon 4. none of the above

    asked by qwerty on November 25, 2014
  20. Neuroscience

    The DNA of a neuron is located in its 1. dendrite 2. axon 3. cell body 4. Golgi apparatus

    asked by qwerty on November 25, 2014
  21. bio+ please check!!!

    The following statement describes, in random order, events during the transmission of a nerve impulse. Use them to answer the next \g question(s). Event 1: Positive ions flow into the neuron. Event 2: The resting potential of the cell membrane is restored.

    asked by Anonymous on February 21, 2007
  22. Psychology

    According to the all-or-none law: a. all axons in an area will fight at a given signal. b. an axon moves from its resting state with various degrees of stimulation. c. only sufficient electrical activity will cause the axon to fire. d. there is a gradual

    asked by Kasey on November 6, 2011
  23. science

    When a nerve impulse reaches a synapse, a nerve cell transfers the impulse to the next nerve cell by releasing D.electric currents. C.chemicals B.heat. A.pressure. Is it D?

    asked by scicenemaster21212 on February 2, 2015
  24. Biology

    18. The function of neurons is to a. maintain a difference in electrical charge across the cell membrane b. have specific ions cross the membrane through ion channels c. maintain a membrane potential with charged ions on either side of the cell membrane d.

    asked by mysterychicken on March 20, 2010
  25. Biology

    18. The function of neurons is to a. maintain a difference in electrical charge across the cell membrane b. have specific ions cross the membrane through ion channels c. maintain a membrane potential with charged ions on either side of the cell membrane d.

    asked by mysterychicken on March 20, 2010
  26. unstanding psychology

    the means of travel within and between neurons is different because: a. electrical signals move impulses within the neuron, while chemical signals move the impulses between neuron. b. chemical signals move the impulses within the neuron, while electrical

    asked by Deanie on July 20, 2011
  27. psychology

    the means of travel within and between neurons is different because: a. electrical signals move impulses within the neuron, while chemical signals move the impulses between neuron. b. chemical signals move the impulses within the neuron, while electrical

    asked by lachelle mitchell on August 12, 2011
  28. health

    Please help as this is so confusing tome! 25. In addition to the nucleus, cytoplasm, and cell membrane, a single neuron possesses A. one dendrite and several axons. B. several dendrites and one axon. C. many nuclei and one neurilemma. D. one nucleus and

    asked by Jackie on June 28, 2010
  29. AP Biology

    I have two questions: 1. Why are action potentials usually conducted in only one direction along an axon? A. The axon hillock has a higher membrane potential than the terminals of the axon. B. The brief refractory period prevents reopening of voltage-gated

    asked by Nikki on November 1, 2010
  30. Physics

    When a nerve cell depolarizes, charge is transferred across the cell membrane, changing the potential difference. For a typical nerve cell, 9.0 pC of charge flows in a time of 0.50ms. What is the average current(Value and units)?

    asked by Anthony on February 17, 2010
  31. General Chem

    The concentration of potassium ions inside a nerve cell is around 20 to 30 times that outside the cell. Calculate the potential difference between inside and outside a nerve cell, if it depends only on this ionic imbalance.

    asked by Anne on December 12, 2007
  32. Biology

    10. In some cats the gene for tail length shows incomplete dominance. Cats with long tails and cats with no tails are homozygous for their respective alleles. Cats with one long tail allele and one no tail allele have short tails. For each of the following

    asked by Tiara on January 24, 2011
  33. Human Anatomy

    Damage to dendrites would interfere with the ability to a. receive nerve impulse b. make proteins c. conduct nerve impulses to another neuron d. release neurotransmitters e. form myelin http://en.wikipedia.org/wiki/Dendrite (Broken Link Removed)

    asked by Da'Sheka on December 20, 2006
  34. physics

    Neurons are components of the nervous system of the body that transmit signals as electrical impulses travel along their length. These impulses propagate when charge suddenly rushes into and then out of a part of the neutron called an axon. Measurements

    asked by Jen on January 21, 2008
  35. Psychology

    The means of travel within and between neurons is different becuase: a. eletrial signals move impulses within the neuron, while chemical signals move the impulses between neurons. b. chemical signals move the impulses within the neuron, while electrical

    asked by Deb on February 22, 2012
  36. Science

    What is the gap called in the neuron? a. dendrites b.axon c.myelin sheath

    asked by Kimberley Martinez on July 25, 2018
  37. Psychology

    The means of travel within and between neurons is different because: A. electrical signals move impulses within the neuron, while chemical signals move the impulses between neurons. B. chemical signals move the impulses within the neuron, while electrical

    asked by Angela on April 12, 2013
  38. biology

    Hi, I appreciate your expert help,and I have a question for you. If I'm asked to decribe resting potential, action poential, and synaptic transmission,in point form;would the following responses be right? Resting Potential: 1.Membrane at resting potential-

    asked by Cliff on April 6, 2011
  39. biology (genetics)

    A pure-breeding white mouse with a long tail was crossed to pure-breeding pink mouse with a short tail. The F1 progeny were all pink with long tails. These F1 mice were test crossed to white mouse with a short tail. If the gene controlling color and the

    asked by Jane on October 24, 2016
  40. Genetics

    A pure-breeding white mouse with a long tail was crossed to pure-breeding pink mouse with a short tail. The F1 progeny were all pink with long tails. These F1 mice were test crossed to white mouse with a short tail. If the gene controlling color and the

    asked by Jane on October 24, 2016
  41. schwann cells

    are they found in central nervous system are they found in peripheral nervous system do they form a myelin sheath do they increase the speed of propagation of nervous impulses Thank you for using the Jiskha Homework Help Forum. Here is a site with the

    asked by cynthia rygalski on November 26, 2006
  42. Psychology

    The means of travel within and between neurons is different because: A. electrical signals move impulses within the neuron, while chemical signals move the impulses between neurons. B. chemical signals move the impulses within the neuron, while electrical

    asked by Angela on April 11, 2013
  43. Science- Cells

    2 adjectives to describe each cell- nerve cell muscle cell bone cell and blood cell

    asked by Anonymous on January 28, 2017
  44. Psychology

    9.By means of introspection, Dr. Marsh attempts to determine the components of things like perception, thinking, and consciousness. By contrast, Dr. Smyth wants to understand what the mind does in producing different kinds of behavior. We can reasonably

    asked by Emma on May 4, 2016
  45. Microbiology

    Which of the following statements about the outer membrane of Gram-negative cell wall is FALSE? A. The outside leaflet is largely composed of lipopolysaccharides. B. The outer membrane contains porins that allow passage of molecules and ions directly into

    asked by Sham on September 5, 2011
  46. math(pls help)

    Most giraffe's have a tail that is 36inches long a leopard's tail is usually 3 inches shorter than a giraffe's tail an Asian elephant's tail is 5 inches longer than a leopard's tail how long is the elephant's tail?

    asked by Ary on October 4, 2018
  47. SCIENCE!!!

    Explain how each of the following cell's structure is related to it's function Red blood cell- Nerve cel- Musle cell-

    asked by Ella on November 22, 2008
  48. Biology

    What type of cell in the central nervous system play an important role in the uptake and processing of neurotransmitters from synaptic clefts? neuron oligodendrocyte microglia endothelial cell ependymal cell

    asked by Anonym on April 10, 2013
  49. Science

    The concentration of k ions inside the nerve cell is about 20 times greater than concentration of these ions outside the nerve cell.what potential difference between outside and inside of the cell would you expect to measure if ths was only due to the

    asked by Prisca on February 7, 2013
  50. Q&A Check Please, science 7th grade

    An impulse is sent from the motor neuron to a(n) _____. sensory neuron? In the part of the inner ear called the cochlea, receptors convert sound vibrations into nerve impulses. true? Involuntary actions are controlled by the ____. spinal cord? The

    asked by rawr... im a dinosaur.... rawr on November 9, 2012
  51. bio

    Action potentials are generated along a neuron because __________. [Hint] of cytoplasmic streaming within the neuron depolarization of the membrane at one point causes an increase of permeability to sodium at the next point they are pulled along by

    asked by carol on November 13, 2008
  52. physics

    A potential difference of 102 mV exists between the inner and outer surfaces of a cell membrane. The inner surface is negative relative to the outer surface. How much work is required to eject a positive sodium ion (Na+) from the interior of the cell? (in

    asked by andrew on May 7, 2012
  53. BIOLOGY!! TEST TOMORROW!!!

    Whats the difference between adrenaline and noradrenaline??? Any help would be appreciated!!! That's a fair question. We'll tackle the simple part first. In North America, we refer to the two compounds as epinephrine and norepinephrine while in the UK

    asked by stressed student on March 5, 2007
  54. science

    I need helping finding a picture of nerve stimulation (neuron stimulates a muscle fiber through a series of steps)!

    asked by bill on February 14, 2008
  55. science

    1. What allows a cell to stockpile substances in greater concentration than they occur outside the cell? is it active transport? 2. The sodium potassium pump prevents the accumulation of what ions inside the cell? 3. Conduction of nerve impulses is

    asked by ava on November 13, 2014
  56. science

    1. What allows a cell to stockpile substances in greater concentration than they occur outside the cell? is it active transport? 2. The sodium potassium pump prevents the accumulation of what ions inside the cell? 3. Conduction of nerve impulses is

    asked by ava on November 12, 2014
  57. biology

    1. What allows a cell to stockpile substances in greater concentration than they occur outside the cell? is it active transport? 2. The sodium potassium pump prevents the accumulation of what ions inside the cell? 3. Conduction of nerve impulses is

    asked by ava on November 11, 2014
  58. physics

    The membrane that surrounds a certain type of living cell has a surface area of 4.4 x 10-9 m2 and a thickness of 1.6 x 10-8 m. Assume that the membrane behaves like a parallel plate capacitor and has a dielectric constant of 4.1. (a) The potential on the

    asked by help on January 19, 2013
  59. physics

    The membrane that surrounds a certain type of living cell has a surface area of 4.9 x 10-9 m2 and a thickness of 1.2 x 10-8 m. Assume that the membrane behaves like a parallel plate capacitor and has a dielectric constant of 5.5. (a) The potential on the

    asked by Shannon on February 18, 2013
  60. Physics

    The membrane that surrounds a certain type of living cell has a surface area of 2.13 x 10-9 m2 and a thickness of 1.94 x 10-8 m. Assume that the membrane behaves like a parallel plate capacitor and has a dielectric constant of 6.4. (a) If the potential on

    asked by Sami on February 10, 2012
  61. science - biology

    Neurons: A. may be myelinated by microglia. B. secrete neurotransmitters from their nerve terminals in response to action potentials. C. are the most abundance cell-type in the brain D. often contain swellings at the nerve endings known as synaptic battons

    asked by Fred on November 9, 2010
  62. biology

    outline why energy is needed for each of these processes: a. the transport of sucrose in a plant b the transmission of an action potential along a nerve axon c. the selective reabsorption of glucose from a kidney nephron I'm not exactly sure how I'm

    asked by grace on September 21, 2011
  63. psychology

    Does the axon or terminal button transmits information to neighboring neuron? I am confused between the two because they both transmits information. Please provide link to your answer.

    asked by susan on September 16, 2012
  64. Anatomy and Phys

    Muscle spindles are supplied by: A. Alpha motor neuron B. Beta motor neuron C. Gamma motor neuron D. Extrafusal motor neuron E. None of the above

    asked by Sarah on December 3, 2014
  65. Biology 101

    What are the factors that cause cells to reproduce in mitosis and meiosis depends on the cells. there's a huge difference between a livwr cell, nerve cell, and a bacterial cell. probably your instructor is looking for answers like: growth, food supply

    asked by Amy on March 9, 2007
  66. Biology

    In what ways are plasma membranes, cell walls, capsules, and sheaths only the outer limits of a cell and not the cell"s boundaries?

    asked by Bea on September 18, 2010
  67. Biology

    In what ways are plasma membranes, cell walls, capsules, and sheaths only the outer limits of a cell and not the cell"s boundaries?

    asked by Bea on September 18, 2010
  68. Biology

    In what ways are plasma membranes, cell walls, capsules, and sheaths only the outer limits of a cell and not the cell"s boundaries?

    asked by Bea on September 18, 2010
  69. A&P

    Situation: You need to step up on a step to reach an object on a high shelf over your head. Your starting point should be anatomical position and your finishing point should be the position you are in once your hand has reached the object overhead. (Part

    asked by Kristy on February 17, 2011
  70. Science

    Structure, Function, Information Processing Test: Unit2 1. Enzymes are important because they: contain water speed up chemical reactions***** contain genetic material help the cell maintain its shape. 2. Which term refers to the diffusion of water through

    asked by QuestionInator on December 8, 2015
  71. Child Development

    Which of the following is TRUE regarding myelination? A) myelination begins prenatally and continues for years after birth. B) Myelination helps nerve impulses travel faster. C) The myelin sheath insulates the nerve cell. D All of these. I think the answer

    asked by Lilly on March 20, 2014
  72. Physics

    During an action potential, Na^+ ions move into the cell at a rate of about 3x10^-7 mol/m^2*s. How much power must be produced by the "active Na^+ pumping" system to produce this flow against a +30-mV potential difference? Assume that the axon is 40cm long

    asked by John on February 12, 2013
  73. Psychology

    According to the all-or-none law: A. all axons in an area will fight at a given signal. B. an axon moves from its resting state with various degrees of stimulation. C. only sufficient electrical activity will cause the axon to fire. D. there is a gradual

    asked by Angela on April 11, 2013
  74. Psychology

    According to the all-or-none law: A. all axons in an area will fight at a given signal. B. an axon moves from its resting state with various degrees of stimulation. C. only sufficient electrical activity will cause the axon to fire. D. there is a gradual

    asked by Angela on April 12, 2013
  75. Psychology

    According to the all-or-none law: A. all axons in an area will fight at a given signal. B. an axon moves from its resting state with various degrees of stimulation. C. only sufficient electrical activity will cause the axon to fire. D. there is a gradual

    asked by Angela on April 12, 2013
  76. Science

    Processing Information 1. Which of the following sets of terms could be used in a description of the peripheral nervous system? :Motor neuron, interneuron, sensory neuron.*** :Brain, sensory neuron, myelin. :Interneuron, spinal cord, autonomic. :Somatic,

    asked by TheLOUDEST_0430 on February 26, 2015
  77. Psychology

    According to the all-or-none law: A. all axons in an area will fight at a given signal. B. an axon moves from its resting state with various degrees of stimulation. C. only sufficient electrical activity will cause the axon to fire. D. there is a gradual

    asked by Angela on April 12, 2013
  78. Chemistry

    There are about 1 x 10^5 chemical reactions per second in each of the 10 billion nerve cells in the brain. How many chemical reactions take place in a day in a single nerve cell?

    asked by Kim on November 13, 2016
  79. Physics please help

    During an action potential, Na^+ ions move into the cell at a rate of about 3x10^-7 mol/m^2*s. How much power must be produced by the "active Na^+ pumping" system to produce this flow against a +30-mV potential difference? Assume that the axon is 40cm long

    asked by John on February 10, 2013
  80. English

    1. The rabbit is medium and white. It has a short tail and sharp teeth. 2. The parrot has a sharp beak. It is small and has colorful wings. 3. The puppy is fluffy and cute. It has a long tail. 4. The squirrel is small and cute. It has a long tail. 5. The

    asked by rfvv on May 29, 2012
  81. Physics

    An unknown potential difference exists between the inner and outer surfaces of the membrane of a cell. The inner surface is negative relative to the outer surface. If 2.5 x 10-20 J of work is needed to eject a positive Calcium ion (Ca2+) from the interior

    asked by Susie on February 25, 2010
  82. PHYSICS

    I'm having some trouble with a problem on my physics pre-exam, if there is any formula please let me know so i can do a bit of research on it. any help is greatly appreciated in advance. The inner membrane of a cell membrane is negative relative to the

    asked by Michelle on February 18, 2018
  83. psychology

    The physical structure of the auditory sense is responsible for transmitting messages about balance to the brain. it does this through: A) The "hammer" and " anvil" bones B) sound waves C) the part of the auditory nerve that is not involved in hearing D)

    asked by loreta on October 22, 2009
  84. Physics

    What would be the physical features of a simplified axon? and how would it differ from a natural axon?

    asked by mm. on March 15, 2010
  85. health

    Neurons carry out the functions of the nervous system by conducting ________. A. Nerve stimulation B. Nerve tissue development C. Nerve impulses D. All of the above I wanna say C, but I want to make sure I am right.

    asked by jessica on January 8, 2014
  86. Math word problem

    Jeff went fishing yesterday and caught a large fish. Upon measuring it he found that the head was 6 inches long. He also noted that the tail was as long as the head plus one-third of the back and that the back was as long as the tail plus twice the head.

    asked by Lucky on September 18, 2013
  87. action potentials

    this is in regards to action potentials. they do not affect the membrane potential of neurons. they increase in magnitude as they travel along an axon. they can be measured by using electodes. there is a loss in signal as they travel along an axon. just

    asked by sarahinwiss on November 26, 2006
  88. physical science

    two forces of 60 and 80 newton respectively act simultaneously at the point ...sketch and determine their resultant force using tail to tail method and tail to tail method

    asked by kgahliso mahlaba on February 1, 2017
  89. physiology

    neurotransmitter release would be inhibited by a.stimulating repolarization of the axon terminal b.blocking Ca2+ influx in the axon terminal c.blocking repolarization of the axon terminal d.stimulating protein kinase activity I think its b, but not sure

    asked by anna on October 12, 2008
  90. math

    A kite and its tail total 36 ft in length. The tail is five times the length of the body. How long is the kite's tail?

    asked by Anonymous on May 20, 2016
  91. medical coding

    in addition to the nucleus, cytoplasm, and cell membrane, a single neuron processes

    asked by Anonymous on July 11, 2010
  92. biology PLEASE HELP

    The __________ (the cell’s outer border) controls the movement of materials into and out of the cell. It is called a lipid bilayer because of the type of molecules it is made up of and it has two layers

    asked by Ann on March 12, 2014
  93. Psychologic

    Steve Porges’ Polyvagal theory posits that the key role of the mammalian vagus nerve is to support human affiliation. Which of the statements below are consistent with scientific findings that Dacher discussed about the vagus nerve? People with stronger

    asked by zxcv on October 27, 2014
  94. Science- Cells

    what connection do you see between the nerve cell's structure and its functions?

    asked by Anonymous on January 28, 2017
  95. Psychology

    Dr. Gillian explained that research has identified over 25,000 genes that are responsible for the genetic information that progresses from generation to generation. These genes are: a. telomeres which cap the chromosome. b. located in a specific order

    asked by Kasey on November 6, 2011
  96. Psychology

    Dr. Gillian explained that research has identified over 25,000 genes which are responsible for the genetic information which progresses from generation to generation. These genes are: a telomeres which cap the chromosome. b located in a specific order

    asked by Nicci on April 28, 2011
  97. math

    WHEN MR. LOWE RETURN FROM HIS FISHING TRIP, HIS STUDENTS INQUIRED AS TO THE LENGTH OF HIS PRIZE CATCH. MR. LOWE ANSWERED. "THE HEAD MEASURED 9 INCHES." "THE TAIL WAS AS LONG AS THE HEAD AND HALF THE BODY." THE BODY WAS AS LONG AS THE HEAD AND TAIL." HOW

    asked by Maya Is The Best Freaking Person Ever! on November 23, 2014
  98. MATH

    WHEN MR. LOWE RETURN FROM HIS FISHING TRIP, HIS STUDENTS INQUIRED AS TO THE LENGTH OF HIS PRIZE CATCH. MR. LOWE ANSWERED. "THE HEAD MEASURED 9 INCHES." "THE TAIL WAS AS LONG AS THE HEAD AND HALF THE BODY." THE BODY WAS AS LONG AS THE HEAD AND TAIL." HOW

    asked by MIMI on May 19, 2010
  99. Math

    If a cat can jump 5 times the length of its tail. How high can the cap jump, if his tail is 13 inches long? (Algebra)

    asked by shelia on December 10, 2012
  100. science

    2. A man is shot in the head, and the bullet stops just outside the dura mater. What is the innermost layer that the bullet has penetrated? A. Skin C. Fat B. Bone D. Periosteum 3. Which part of the brain is responsible for the maintenance of muscle tone

    asked by JT WALLS on November 12, 2010