A cell has enough available ATP to meet its needs for about 30 seconds. What is likely to happen when an athlete exhausts his or her ATP supply?
A) Other cells take over, and the muscle cells that have used up their ATP cease to function.
B) Catabolic processes are activated that generate more ATP.
C) He or she has to sit down to rest.
D) ATP is transported into the cell from the circulatory system.
Answer: B) Catabolic processes are activated that generate more ATP.