Question 24 Which of the following responses would be expected from an endurance

Question

Question 24

Which of the following responses would be expected from an endurance training program?

A.

decreased number of mitochondria in type I fibers

B.

decreased capillary density in type I fibers

C.

increased Krebs Cycle enzymes in type I fibers

D.

increased glycolytic enzymes in type IIx fibers

E.

decreased beta oxidation enzymes

18. Which of the following is not a reason a-vO2 difference improves with exercise training?

A.

Increased capillary density

B.

Increased mitochondria number

C.

Increased muscle blood flow

D.

Increased mitochondria enzyme function

E.

Increased venous return

Basically the body core temperature is regulated during exercise in hot weather by __?__.

A.

decreasing the heart rate

B.

increasing the flow of warm blood to the body core so that it will be cooled by convection

C.

shifting warm core blood to the skin so that it can be cooled by evaporation of sweat

D.

vasoconstriction of the vessels near the skin so that radiation by the sun does not warm the blood

E.

C and D are both correct

A.

decreased number of mitochondria in type I fibers

B.

decreased capillary density in type I fibers

C.

increased Krebs Cycle enzymes in type I fibers

D.

increased glycolytic enzymes in type IIx fibers

E.

decreased beta oxidation enzymes

Explanation / Answer

Question 24

Answer C and D

Increased Krebs cycle enzymes in type I fibers

increased glycolytic enzymes in type II fibers

during training endurance, increased metabolism of substances.increased utilization of energy that can be provided by above process.mitochodria levels also increased. capillary density also increased.

Question 8

Answer is E

aVO2 means the different oxygen content in the artery and venous blood.

The factors increasing the aVO2 during exercise are

i. Increased capillary density

ii. Increased mitochondria number

iii. Increased muscle blood flow

iv. Increased mitochondria enzyme function

Question

Answer B and C

Thermoreceptors in the skin and body core provide input into the hypothalamic thermoregulatory center where this information is processed, via a proportional control system, with a resultant signal for heat loss by the thermoregulatory effector responses of sweating and alterations in skin blood flow .

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