1. hich of the following is true of physiological regulation? a. All animals are

ID: 203456 • Letter: 1

Question

1. hich of the following is true of physiological regulation?

a. All animals are able to regulate a given physiological variable to the same extent.

b. All physiological variables are regulated within a given animal to the same extent.

c. Negative feedback mechanisms are frequently involved in physiological regulation.

d. Positive feedback mechanisms are frequently involved in physiological regulation.

2. Which of the following statements is generally true of the ionic relations of animal cells?

a. [Na+ ] in > [Na+ ] out

b. [K+ ] in > [K+ ] out

c. [Cl] in > [Cl] out

d. [Ca++] in > [Ca++] out

e. All of the above statements are true.

f. None of the above statements is true.

3. Afferent neurons carry information:

a. From the sensory organs towards the central nervous system.

b. From the motor regions toward the central nervous system.

c. From the central nervous system towards the motor regions.

d. From the central nervous system towards the sensory organs.

4. Myelin sheaths:

a. Are excitable.

b. Insulate axons preventing loss of current.

c. Are responsible for the gray color of gray matter.

d. Increase cross-sectional area of axons for purposes of signal propagation.

e. All of the above.

1.c. negative feedback mechanisms are frequently involved in physiological regulation.

2. b. [K+] in > [K+] out

3. a. from sensory organs towards the central nervous system.

4. b. insulate axons preventing loss of current.

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