Question

which of the following sources of energy give you only about 15 seconds of energy for a muscle contraction?
answers: a - e
a creatine phosphate
b krebs cycle
c beta oxidation
d aerobic respiration
e anaerobic glycolysis

Explanation:

Creatine phosphate is a high - energy molecule that can rapidly donate a phosphate group to ADP to form ATP. This process is very quick but has a limited supply. It can provide energy for muscle contraction for approximately 15 seconds. The Krebs cycle (B) and aerobic respiration (D) are part of the long - term energy production pathways (aerobic metabolism) that occur over minutes to hours. Beta oxidation (C) is the process of breaking down fatty acids and is also part of the long - term energy supply. Anaerobic glycolysis (E) can provide energy for a few minutes (up to about 90 seconds in some cases). So, among the options, creatine phosphate (A) is the source that gives about 15 seconds of energy for muscle contraction.

Answer:

A. Creatine phosphate