When a muscle cell demands energy to perform its work of contraction, ATP
A) catalyzes the reaction.
B) is broken down and liberates energy.
C) is phosphorylated.
D) manufactures more ATP.
E) enters a metabolic pathway.

Question

Quizplus · Accepted Answer

ATP (adenosine triphosphate) is the primary energy carrier in cells. When a muscle cell contracts, it requires energy, which is obtained by breaking down ATP into ADP (adenosine diphosphate) and an inorganic phosphate, releasing energy in the process.

When a Muscle Cell Demands Energy to Perform Its Work