Question

When ATP levels are low, the relationship between ATP and creatine phosphate is that

A. ATP supplies energy to synthesize creatine phosphate from creatine and phosphate.
B. creatine phosphate supplies energy to regenerate ATP from ADP and phosphate.
C. both have three phosphate groups.
D. both are required to stimulate a muscle to contract.

Answer 1

Creatine phosphate helps regenerate ATP from ADP and phosphate when ATP levels are low, providing quick energy for muscle contractions but only for a short duration.

Step-by-step explanation:

When ATP levels are low, the relationship between ATP and creatine phosphate is that creatine phosphate supplies energy to regenerate ATP from ADP and phosphate. This process is essential for providing quick bursts of energy for muscle contractions.

Creatine phosphate acts as an energy reserve that can be tapped into rapidly to synthesize more ATP when the muscle becomes active. The enzyme creatine kinase catalyzes the transfer of a phosphate group from creatine phosphate to ADP, forming ATP and creatine.

This ATP then provides the energy needed for muscle contraction, especially in the initial stages where rapid energy supply is critical. However, it's important to note that this energy source is short-lived and sustains muscle activity for only about 15 seconds.