1. If a person is performing the equivalent of 5 kcal/min of external work with

Question

1. If a person is performing the equivalent of 5 kcal/min of external work with a mechanical efficiency of 20%, he/she is generating heat at the rate of:

a. 1 kcal/min

b. 5 kcal/min

c. 10 kcal/min

d. 20 kcal/min

2. The molecule that is the independent force-generator in muscle fibers is:

a. troponin

b. tropomyosin

c. actin

d. myosin

3. The two general mechanisms by which muscle improves its force-generating capacity (i.e., strength) in response to training are:

a. hypertrophy and stretch-shorten cycle potentiation

b. hypertrophy and hyperplasia

c. hyperplasia and neural facilitation

d. hypertrophy and neural facilitation

4. In a highly motivated person, the decrease in strength as a result of repeated muscle contractions (i.e., fatigue) normally results from:

a. changes in the brain

b. failure of transmission of nervous impulses from the brain to the muscle in the spinal cord

c. failure of transmission of the nervous impulses from the alpha motor neuronsto the muscle fibers

d. changes within muscle fibers

Explanation / Answer

1.

C.10kcal/min.

2. d.myosin

Myosin is the molecule that present in the muscle fibers mainly in thick and thin filaments helps in voluntary contraction of muscles sometimes.

3.

d. Hypertrophy and neural facilitation. To combat the oxygen deficiency during muscle training its increases in size ( hypertrophy). Neural facilitation nothing but stimulus that have been transferred to the muscles.

4.d. Changes within muscle fibers.

Fatigue of muscle fibers mainly with two mechanisms. One is decreased ability of muscle fibers to function ( muscle fatigue). Another one is nerve can't generate and transmit impulses ( neural fatigue).

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