2011 physiology

Question 1

What is the method of regulation of oxytocin concentration?

a. Positive feedback
b. Negative feedback

Answer 1

a. Positive feedback

Question 2

What is the function of myosin I?

Answer 2

Attaches the membrane to the cytoskeleton

Question 3

What is the role of microtubule-associated proteins?

Answer 3

Transport of vesicles to the nucleus

another exam has a different answer!

Question 4

How is calcium transported from the lumen of the endoplasmic reticulum to the cytoplasm?

Answer 4

Passive diffusion

Question 5

Why do vascular smooth muscle cells experience no fatigue?

Answer 5

Because of slow cross-bridge cycling

Question 6

What stabilizes unbound steroid receptors in the cytoplasm?

Answer 6

Heat-shock proteins

Question 7

What results in the repolarization of the membrane?

Answer 7

Efflux of positive ions and influx of negative ions

Question 8

What is responsible for the depolarization phase in nerve cells?

Answer 8

Na+ influx through gated channels

Question 9

pH: 7.3 (7.35-7.45)
CO2: 47 (35-45)
HCO3-: 27 (22-26)
What acid-base disorder does the patient have?

Answer 9

Respiratory acidosis

Question 10

A man has a body-fat percentage of 31%. What can you conclude from this?

a. He is healthy
b. He is obese
c. He is underweight

Answer 10

b. He is obese

Question 11

Which of the following initiates exocytosis?

Answer 11

Binding of v-snare to t-snare

Question 12

What is the center of thermoregulation in the body?

Answer 12

Hypothalamus

Question 13

In a state of tetani, which ion exhibits excess release in muscle cells?

Answer 13

Ca2+

Question 14

Where are desmosomes found in high concentrations?

Answer 14

Skin

Question 15

A cell releases a messenger that diffuses and acts upon a nearby cell without going to the circulation. What is this called?

Answer 15

Paracrine

Question 16

A sample of tissue was left to dry out. After a few hours, the sample’s weight dropped from 100g to 90g. What type is this tissue?

Answer 16

Adipose

Question 17

Which of the following occurs during an event of hypertonic expansion?

Answer 17

ICF osmolarity increases

Question 18

According to the starling equilibrium, what is responsible for removing the excess fluid from ISF space back to the circulation?

Answer 18

Lymphatic drainage

Question 19

Which of the following cells exhibit unstable depolarization?

Answer 19

GI smooth muscle cells

Question 20

The cell creates a gradient of substance X by driving it against its concentration gradient. Substance Y uses the gradient of X to gain entry into the cell. What type of transport is this?

Answer 20

Secondary active transport

Question 21

Which hormone is responsible for milk production?

Answer 21

Prolactin

Question 22

Which of the following is true regarding the disposal of ammonia in the body?

Answer 22

It is first converted to urea by the liver and then filtered by the kidneys

Question 23

Damage to which part of the brain results in loss of the working memory?

Answer 23

Prefrontal cortex