Question

Which energy substance does the body use DIRECTLY (no other step needed) to perform its multitude of functions, such as muscle contraction?

Answer 1

ATP is the energy substance used directly by the body to perform functions like muscle contraction. It provides energy for cross-bridge formation and filament sliding. ATP can be quickly regenerated through various mechanisms such as creatine phosphate metabolism, anaerobic glycolysis, and aerobic respiration.

Step-by-step explanation:

ATP (adenosine triphosphate) is the energy substance that the body uses directly to perform its multitude of functions, including muscle contraction. ATP provides the energy for cross-bridge formation and filament sliding, which are essential for muscle contraction to occur. Although the amount of ATP stored in cells is low, it can be quickly regenerated through mechanisms such as creatine phosphate metabolism, anaerobic glycolysis, and aerobic respiration.