human anatomy and physiology

posted by .

cells are the basic unit of life based on the original cell theory. name and define the function of at least nine organelles of animal cells.


You will find a list of 14 cell organelles and their functions (what they do) at:
http://library.thinkquest.org/12413/structures.html


Why is it important that digestive enzymes are inactive in the pancreas?


What four elements make up the bulk of all living matter?


I am a little confused about the action potential concept (see nervous system)

I have 3 multiple-choice questions that I need help with:

Which is the correct sequence of events that follows a threshold potential:
1.the membrane becomes depolarized
2.sodium channels open and sodium ions diffuse inward
3.the membrane becomes repolarized
4.potassium channels open and potassium ions diffuse outward while sodium is actively transported out of the cell
A)3,2,4,1
B)2,1,4,3
C)2,1,3,4
D)1,2,4,3
E)4,1,3,2

My answer is C, but not sure because the questions refers to the sequence of events THAT FOLLOWS A THRESHOLD POTENTIAL. The correct answer could be D?

Second questions is:

An action potential:
A)is essential for impulse propagation
B)involves the influx of negative ions to depolarize the membrane
C)involves the outflux of negative ions to depolarize the membrane
D)involves the outflux of positive
ions to depolarize the membrane
E)is initiated by potassium ion movements

My answer is A

Match the following:

1.Period when the interior of the cell becomes less negative due to an influx of sodium ions

2.Term a nerve impulse when transmitted

A)action potential
B)saltatory conduction
C)repolarization
D)depolarizarion

My answer is 1.D and 2.A

Thank you for your help.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Biology

    Bacterial cells are prokaryotic. Select two structures of bacterial cells and briefly describe them; what do they look like, what are they composed of?
  2. biology

    do you have basic cell structure typical plant vs animal cells organelles- stucture and function DNA DNA replication
  3. Science Word

    Is cell theory is 1. the mayjor theory of life science 2. the cell is the basic unit of life 3. organisms are made up of one or more cells 4. all cells come from other cells I know it's 1 Im justing sure it's more than a answer. You …
  4. Science 7R Q2

    What is the difference between a plant cell and an animal cell?
  5. Cynthia

    Which of the statements below correctly compares features of plant and animal cells?
  6. science

    which of the following is not part of cell theory?
  7. Science

    Which of the following is not part of the cell theory?
  8. Science

    Which of the following is not part of the cell theory?
  9. 9th Grade Biology

    Cell theory is based on a series of discoveries. In 1655, Robert Hooke coined the word "cell" from his investigations of cork cells. Almost two hundred years later, Schleiden and Schwann proposed the cell theory that states that: All …
  10. Science

    1. How does plant cell mitosis differ from animal cell mitosis?

More Similar Questions