Question 56 During a starvation state protein can be degraded for energy use dur

Question

Question 56

During a starvation state protein can be degraded for energy use during exercise by breaking down amino acids into which of the following?

A.

Acetyl-CoA

B.

Krebs cycle intermediates

C.

Pyruvate

D.

All of the above

E.

B and C only

Question 57

A person exercises in their “fat burning zone” for 4 hours at 35% VO2peak. The O2 cost of exercise at that work rate is 0.5L/minute. Following exercise the subject rewards himself with an ice-cream sundae (700kcal). The following statement is true(assume 5kcal/lit of O2):

A.

The subject is in neutral energy balance

B.

The subject consumed fewer calories than they expended during exercise

C.

The subject consumed more calories than they expended during exercise

D.

Can’t say

A.

Acetyl-CoA

B.

Krebs cycle intermediates

C.

Pyruvate

D.

All of the above

E.

B and C only

Explanation / Answer

56.

Amino acids can be converted via the Krebs’ cycle to glucose for energy or for storage as glycogen and fat. During times of increased stress like in trauma, exercise, starvation and disease states, amino acids can be catabolized into intermediates to produce energy for muscular contraction. In gluconeogenesis pyruvate are formed from amino acids and final end product in Krebs cycle in acetyl Co A.

Answer is D.

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