Question

question 7
10 points
most of the atp supplies for a skeletal muscle undergoing prolonged exercise come from _.
a glucose metabolized by aerobic respiration
b the transfer of a phosphate group from creatine phosphate
c glycolysis
d tropomyosin binding to calcium
question 8

Explanation:

• Option A: Aerobic respiration of glucose produces a large amount of ATP. During prolonged exercise, the body can continuously supply oxygen, and aerobic respiration becomes the main way to produce ATP for skeletal muscles.
• Option B: The transfer of a phosphate group from creatine phosphate is a quick way to supply ATP but is mainly for short - term, high - intensity bursts of energy (e.g., very short - term muscle contractions like a quick lift), not for prolonged exercise.
• Option C: Glycolysis can produce ATP, but it produces relatively less ATP compared to aerobic respiration, and in the case of prolonged exercise with sufficient oxygen supply, aerobic respiration is more dominant.
• Option D: Tropomyosin binding to calcium is related to muscle contraction regulation (it is part of the mechanism that allows actin and myosin to interact for contraction), not directly to ATP production.

Answer:

A. glucose metabolized by aerobic respiration