Thursday
August 28, 2014

Posts by lena


Total # Posts: 995

Primary Auditory Cortex (Psych)
In lecture the prof says A1 and primary visual cortex interchangeably. Are they the two just different ways of referring to the same thing or is A1 a specific regions in the primary auditory cortex?
March 29, 2011

algebra 2
Refer to the question you posted above this one for how to solve this type of question. Again, if you post what you believe the answer should be, I will try to solve this and I'll let you know what I got.
March 28, 2011

aims math<<<<need some one to check my answer
37-3[5+4(3-7)] 37-3[5+4(-4)] 37-3[5-16] 37-3[-11] 37+33 70
March 28, 2011

Math
First you must ask yourself what is mean weight? It is the average weight. So let's take the 2nd graders for example. To find the mean weight, they took the weight of 75 2nd graders, added it all together and divided by 75. To find the total weight of the 2nd graders, you ...
March 28, 2011

Biology - The Stomach
When referring to the lumen of the stomach is that just the opening. As in where are the HCl is and where your food enters? I googled the definition of lumen and it says inside space. I'm just not too clear on what it really means. Thanks.
March 27, 2011

Biology- GI Tract
I have a question regarding the gastric wall. Do the epithelial cells of the mucosa secrete substances directly into the lumen or do they secrete into the gastric pits then then from there the substances go into the lumen?
March 27, 2011

Biology - GI Tract
Thanks Ms. Sue! :D
March 27, 2011

Biology - GI Tract
I have a question about Vit B12. Where is it absorbed in the body? In lecture, the professor stated once that it's absorbed in the small intestine and then later stated it was the large intestine. I'm thinking small intestine makes more sense but I'd like to make ...
March 27, 2011

Biology - GI Tract
Thank you!
March 27, 2011

Biology - GI Tract
In my notes it says that the last 2/3 of the esophagus is controlled by smooth muscle (controlled by ANS and ENS). What is ENS? I'm listening to the lecture the it's something nervous system but I have no idea what the E stands for.
March 27, 2011

Biology
Thank you very much! I really appreciate it!
March 27, 2011

Biology
Sorry for reposting but I really need help with this question and I've waited several hours. What is the trigone of the bladder bounded by? a) top of fundus and uretal orifices b) major and minor calyces c) orifices of ejaculatory ducts and urethra d) uretal and internal ...
March 27, 2011

math
The factors for 7 are 1 and 7 The factors for 23 are 1 and 23
March 26, 2011

math
The multiples of 7 are not 7 and 1, rather what I meant to say is that 1x7 =7, the multiples of 7 would be 7,14,21 ect. Sorry if that confused you. Same with the number 23.
March 26, 2011

math
If a number is prime then you know that it's a multiple of itself and the number 1. Example: Multiples for 7 are 7 & 1 Example: Multiples for 23 are 23 and 1 If you wanted to find the the LCM of both it would have to be 23 x 7 Do you understand why? There is no number ...
March 26, 2011

Biology - The Bladder
What is the trigone of the bladder bounded by? a) top of fundus and uretal orifices b) major and minor calyces c) orifices of ejaculatory ducts and urethra d) uretal and internal urethral orifices
March 26, 2011

The Nephron
Concentration and volume of urine depend on H2O reabsorption where in the nephron? a) ascending loop of Henle b) descending loop of Henle c) distal convoluted tubule and collecting duct d) proximal convoluted tubule >>> I think the answer is C but I'm not entirely...
March 26, 2011

Mensturation
Thank you very much!
March 26, 2011

Mensturation
I have a question. In my anatomy textbook it says that during menstrual cycle, the epithelial cells of the endometrium are shed. Are germinal epithelial cells the same thing?
March 26, 2011

math
I used to post questions like this on this homework help forum and I would always get a response that would tell me that this is a homework help forum and not a place for someone to do your homework for you. I think if you showed some of your thinking then some of the tutors ...
March 26, 2011

math
Do you recall BEDMAS? That's the order in which you solve. Brackets first then exponents. In your case there are no brackets nor are there any exponents. So go into multiplication and division and then addition and subtraction.
March 26, 2011

trig
In order to find the length of [AM], you want to look at only half of this triangle. Half of an isosceles triangle is a right angle triangle! Therefore you can use Pythagorean theory: a^2 + b^2 = c^2 (hypotenuse) Do you think you can solve this from here?
March 26, 2011

sodium tetraborate
How is the mass of sodium tetraborate related to the amount of stretch in slime? I was doing some googling and I came across something that had to do with cross-linking but I didn't really understand it. Could someone explain why the slime gets more or less stretchy?
March 26, 2011

geometry
Is this shape supposed to be a triangle? And if so, how is B the midpoint if it is a corner of the triangle? I'm a little confused. If you clarify this, maybe I would help you solve your question.
March 26, 2011

Bio - Reproductive Organs
For the first statement, I'm pretty sure there's cilia which move the occyte through the tube as opposed to peristalsis, but correct me if I'm wrong.
March 26, 2011

Bio - Reproductive Organs
Is this true? The oocyte is moved through the fallopian tubes by peristaltic contractions of the muscular layer >>> I feel as though this may be correct but I'm not too sure AND The outer layer of the fallopian tube is formed by the ampulla >>> I feel ...
March 26, 2011

math
What are you trying to figure out here? (x,y) ?
March 25, 2011

math
No problem :)
March 25, 2011

math
Ok so for this you would want the person to add the number '2.5', 5 times. So could you say something like: Kate went to the grocery store and wanted to buy 5 apples. One apple costs $2.50. How much would Kate's total come to?
March 25, 2011

math
Hi Irma. Could you explain to me what the repeated addition model is? I think if I understood what the model actually is that I could help you with this problem.
March 25, 2011

math
If you're referring to an x-y table then would you not just sub in a value for x and find the consequent value for y? For example: Lets sub in 0 for x y= 1/2 (0-8) y = 1/2 (-8) y = -4 Lets sub in 1 for x y= 1/2 (1-8) y = 1/2 (-7) y = -3.5 I believe this is what you're ...
March 24, 2011

math
Or you could say 3/2 is 3 times greater than 1/2. You're comparing the two fractions with the number '3'. Maybe if you clarify your question I could be more helpful.
March 24, 2011

math
I don't know what you're asking here but maybe this is referring to ratios. For example: 1/2 and 3/2 have a ratio of 1:3
March 24, 2011

MATH
the hundreadth value in this case would be zero
March 24, 2011

MATH
Sorry, correction: (14+23)/2
March 24, 2011

MATH
Rounding to the nearest hundreadth means to 2 decimal places just in case you were unaware
March 24, 2011

MATH
To find the median, you want to arrange the #s from least to greatest and remove a number from each side. If you do so, you'll find that you have the numbers 14 and 23 left in the middle. You then want to find the average of the two. Therefore you would do the following: (...
March 24, 2011

algebra
I just realized the long division is completely unnecessary. You could just simply factor the x out. -_- x^3=5x^2+4x = x(x^2-5x+4) = x(x-1)(x-4) Hope this makes more sense. Ignore what I did above. It's completely wrong.
March 24, 2011

algebra
I think I may have done an error here. The expanded form the factored equation does not equal the equation above. Hmmm...I'm going to recheck and get back to you if I figure it out.
March 24, 2011

algebra
For this equation you should find that (x+1) is a factor. If you sub 1 in for the x-values you should get a result of zero. So next you do the following: (x+1) divided by (x^3-5x^2+4x) - First you divide the (x^3) by (x+1) and you find that in order to get x^3 you must ...
March 24, 2011

Hypoventilation VS Bradyapnea
Thank you so much!
March 24, 2011

Hypoventilation VS Bradyapnea
Hypoventilation VS Bradyapnea What's the difference b/t the two? Aren't they both decreased breathing rate?
March 24, 2011

math
TV sets are measured according to their diagonal distance from one corner to the opposite. Therefore, I feel as though for this question it's simply asking you to find the distance from the one corner to the opposite. To do this you want to view this as a triangle rather ...
March 24, 2011

math
This question does not make much sense to me. Do you think you could rephrase this and post again. I'll try to help. As of now you said there is a triangle with a square attached (singular) yet you're giving me the areas of 2 different squares. I'm a tad bit confused.
March 24, 2011

math
Future Population = Current Population x 1.5^(hours) I think this would be the exponential equation. So if you sub in 4 for hours you should get the correct answer.
March 24, 2011

Math
We want to view this as a triangle: ......x <--- lets say this is the kite angle to kite = 52 degrees ............. ground So you know the hypotenuse of this triangle is 100 ft. We want to find out the height. I don't know if you've been taught these acronyms: SOH ...
March 24, 2011

Nutrition (Blood Tests)
If there was an eight year old boy who wasn't get enough to eat and was not eating nutritious foods, what kinds of things would be wrong with him? What things would be wrong in his blood tests? This is what I'm thinking: - prolonged hunger - depression: reduced levels ...
March 24, 2011

Reproductive Cycle
What stimulating factor(s) and receptor(s) could be inhibited that would decrease the release of estrogen? I talked about how you could inhibit GnRH, LH and FSH. But I can't think of any receptors or any other stimulating factors. Any suggestions?
March 21, 2011

acid-base question
This is what I'm currently thinking. When you have a heart attack you have a decreased amount of oxygen going to the heart. Therefore anaerobic cellular respiration takes place and as a result you get lactic acid. When the glycogen stores are depleted, you get the ...
March 21, 2011

acid-base question
This man had a myocardial infarct a couple days ago and his lab report from an arterial blood sample reveals this (normal values in brackets): pH 7.30 (7.35-7.45) HCO3- = 20 mEq/liter (22-26) PCO2 = 32 mmHg (40 mmHg) What's his acid-base status and what compensation is ...
March 21, 2011

Maths
How to find a range (not domain) of function f(x)=square root of x^2-1/square root of 9-x^2
March 21, 2011

Loop of Henle
What would happen to the concentration gradient in the tissues in the thick ascending limb loop of Henle if you used loop diuretics for too long? I know that if you use them K+ isnt being recycles and therefore theres no electropositive gradient being created and therefore no ...
March 20, 2011

DNA + Genetics
During the menstrual cycle, the ovarian steroid hormones estrogen and progesterone control a dramatic transcriptional reprogramming of endometrial stromal cells (ESCs) leading to a receptive state for blastocyst implantation and the establishment of pregnancy. A key marker ...
March 19, 2011

Evolutionary Science
I'm reading this article and I'm having difficulty understanding some of the terminology. It says the following: "We show that endometrial PRL expression is a derived feature of placental mammals and that the episode of positive selection in HoxA-11 occurred ...
March 16, 2011

Evolutionary Science (stem-lineage?)
Thank you so much! I really appreciate it!
March 15, 2011

Evolutionary Science (stem-lineage?)
I'm reading this article and it says the following: "the PRL regulatory gene HoxA-11 experienced a period of strong positive selection in the stem-lineage of eutharian mammals" What does this mean? I'm not to sure what they mean when they're referring to ...
March 15, 2011

Heptic Sinusoid
Hepatic* and I feel as though they're just areas in which blood pass through. That's all I really know. Is there more to them?
March 10, 2011

Heptic Sinusoid
What's the function of the heptic sinusoid? I've tried googling but I can't seem to find much on it.
March 10, 2011

Math
(4y + 5) /2 = y + 9 - first start off by multiplying both sides by 2 so get rid of the divided by 2 on the left side 4y+5 = 2(y+9) 4y+5=2y+18 - so you want to bring Y's to one side and the numbers to the other 4y-2y= 18-5 2y= 13 y=7.5 Hope this explains it.
March 3, 2011

Hydrogen bonding with polypeptides
Thank you very much.
March 3, 2011

Hydrogen bonding with polypeptides
I'm going to have to ask my prof about this because in lecture she apparently tricked us because we all had chosen C as the answer.
March 3, 2011

Hydrogen bonding with polypeptides
Apparently the correct answer is in fact d) howevere I don't even understand what d) is means. Amide: o=c-nh Aspartyl: CH2-COO- I understand that it may bind to the O- on aspartyl but why would hydrogen binding occur b/t the c-nh when carbon is already bonded to the nitrogen?
March 3, 2011

Hydrogen bonding with polypeptides
In a polypeptide at physiologic pH, hydrogen bonding may form between which of the following? a) side chains of leucine residue and lysine residue b) side chains of aspartyl residue and glutamyl residue c) terminal amino acid group and terminal carboxyl group d) amide group in...
March 3, 2011

Peptide Bonds
Thank you!
March 3, 2011

Peptide Bonds
Which of the following shows linear sequence of atoms joined by covalent bonds in peptide backbone. a) -N-C-C-N-C-C-N b) -N-C-O-N-C-O- c) -N-C-C-O-N-C-C-O d)-N-H-C-C-N-H-C-C The answer is a). Is that because it's the only one that linear; as in it doesn't have any ...
March 3, 2011

Chem - Butyrate?
Where is the butyrate coming form. I now understand the 3-hydroxy aspect of it but how is the end named? Thanks Dr.Bob
March 2, 2011

Chem
CH3-COOH-CH-COO- 3-hydroxybutyrate or β-hydroxybutyrate I have no idea why this is named what it is named. I know that the COO on the end is the most oxidized. I don't understand why a 3 is being used. Would it not be 4 b/c there are 4 carbons. I'm just overall ...
March 2, 2011

Chem
Thanks DrBob!
March 2, 2011

Chem
HCl -> H+ + Cl- In this scenario would the HCl be a strong acid and the Cl- the base? And do you only use the word conjugate bases when dealing with weak acids? Thanks.
March 2, 2011

Random question
Thanks! :D
February 28, 2011

Random question
awesome :O thanks so much ms.sue
February 28, 2011

Random question
Hi this is kind of random but since this is a a homework help website I feel as though you would be able to give me a good answer. I want to be a tutor in my local area for elementary, middle and highschool school kids but I don't really know what to put on my ...
February 28, 2011

Biochem - Diabetes
I drew myself a picture and I think I may understand a little more. This is my new thinking. If you were to just give plain water then the water would be taken up by the cells b/c the solute:water ratio in the cells would be less than that in the blood so water would move from...
February 27, 2011

Biochem - Diabetes
Type 1 diabetic injected insufficient insulin so her body can’t use glucose in blood. Blood glucose is 38 mM (normal value = 3.3-5.8 mM). To adjust osmolality, she increased urine output = dehydration. Should she be treated with water? The answer is NO and my teacher said...
February 27, 2011

Calculus
The area a meadow was approximated by measuring the length of the meadow at 30-foot intervals. THe distances measured across the meadow were 76 ft, 118 ft, 130 ft, 143 ft, 139 ft, 136 ft, 137 ft, 139 ft, 130 ft, 122 ft, and 60 ft. Use Simpson's Rule to approximate the area...
February 26, 2011

Math/Radioactive Dating
I dont think log will work either because I tried it and I got a different answer :(
February 19, 2011

Math/Radioactive Dating
Thanks Reiny :)!
February 19, 2011

Math/Radioactive Dating
Thanks a bunch DrBob! :D
February 19, 2011

Math/Radioactive Dating
I think I know what I did wrong. If someone could let me know if my new understanding is right. If the ratio is 1:3 then you would have 1/4 K and 3/4 Ar so equation should have been: 1/4 = 1/2 ^(t/(1.25 *10^9)) Makes sense? Then as an answer you would get: (log 1/4 / log 1/2...
February 19, 2011

Math/Radioactive Dating
Whats In? I'm so confused :( We were told to figure this out using half-life. Our prof didn't even use logs or anything of that sort.
February 19, 2011

Math/Radioactive Dating
Aha thank you very much! :)
February 19, 2011

Math/Radioactive Dating
My teacher said that if the ratio of mass (in a rock) for 40K and 40Ar was 1:3 then the age of the rock would be 2.5 billion years. I don't understand how he concluded that to be the age. The only thing he knew was that the half-life of K40 = 1.25 billion year. This is my ...
February 19, 2011

Math/Radioactive Dating
How would I calculate the age of a rock only given the amount of each in grams and half-life? 40K decays to 40Ar. Half life of 40K is 1.25 billion years. 40K = 20 grams 40Ar= 5 grams I think the formula is Final Amount of 40K = Initial Amount of 40K * (1/2)^(time/half-life) If...
February 19, 2011

Biology
Supposing you have a renal stenosis, what kind of affect does that have on the heart. What I do know: - decreased flow to the kidneys - kidneys assumes that overall blood volume have decreased - RNN system is activated - = increase in blood pressure (hypertension) I'm ...
February 5, 2011

math
sam has a savings amount that increased in value over a twelve month period from $8765.00 to $9006. he made no deposits or with drawls in that time. What percent interest did he recieve for the 12 month period
January 25, 2011

5th grade algebra
thanks ur kind
January 19, 2011

calculus ap
find limit as x goes to infiniti of 8x^4-3x^2+2 over 9x^5+7x^4-3x^2+2
January 2, 2011

calculus ap
what is the slope of the line tangent to the curve y^3+x^2y^2-3x^3=9 at the point (1,2)?
January 2, 2011

calculus ap
thank you
January 2, 2011

calculus ap
what is the slope of a line tangent to y=sin^2(5x+pi) at x=pi/4?
January 2, 2011

Chemistry
How many milliliters of 0.710 M HCl are required to react with 47.80 grams of CaCO3 ? Given the balanced reaction equation: 6 FeCl2(aq) + K2Cr2O7(aq) + 14 HCl(aq) 6 FeCl3(aq) + 2 CrCl3(aq) + 2 KCl(aq) + 7 H2O(l) How many moles of FeCl2(aq) are required to produce 2.811 mol of ...
November 28, 2010

Chemistry
student did the Synthesis of Salicylic Acid experiment using 3.93 g of methyl salicylate. This was the limiting reagent for his experiment. What is the theoretical yield of salicylic acid for his experiment? The theoretical yield is:
November 16, 2010

Chemistry
A student did the Synthesis of Salicylic Acid experiment starting with 3.89 g of methyl salicylate (C8H8O3) and using 40 mL of 6.0 M NaOH. To evaluate her success she needs to determine the limiting reagent. The reaction goes as follows: C8H8O3 + H2O ==> C7H6O3 + CH3OH. ...
November 16, 2010

Calculus
q 0 125 250 375 500 625 750 C'(q) 26 24 30 26 23 25 29 a) If the fixed cost is $8500, use the average of left- and right-hand sums to determine the total cost of producing 500 units. Answer: $ b) How much would the total cost increase if production were increased one unit...
November 15, 2010

Calculus
Match: A. r(1997)−r(1992) B. ∫19921997r′(t)dt C. r(1997) D. ∫19921997r(t)dt E. [ r(1997)−r(1992)/1997−1992] and interpretations: A. Average rate of change of the debt rate between 1992 and 1997 B. Change in debt rate between 1992 and 1997 C...
November 15, 2010

Calculus
Oil is leaking out of a ruptured tanker at a rate of r = 19e^(2t) gallons per hour. Write a definite integral that represents the total quantity of oil which leaks out of the tanker in the first 3 hours. Using your formula answer the following questions: A. Estimate the ...
November 14, 2010

algebra
explain how you could show five less than a number using an expression
October 18, 2010

math
explain who you could show five less than a number using an expression
October 18, 2010

math
how do you write 2320640 in two significant figures?
October 10, 2010

Physics
If I hold a rock at some height and tell you the potential energy there is 25 J, what is it's kinetic energy immediately before it hits the ground?
October 8, 2010

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