MICROANATOMY

Detailed explanation-1: -Answer and Explanation: The only energy source that can be used to power muscle activity is ATP which stands for adenosine triphosphate. In order to generate ATP, a process known as cellular respiration occurs in the presence of oxygen.

Detailed explanation-2: -Three energy systems function to replenish ATP in muscle: (1) Phosphagen, (2) Glycolytic, and (3) Mitochondrial Respiration.

Detailed explanation-3: -Adenosine triphosphate (ATP) is the source of energy for all muscle contractions. Energy is released when ATP is broken into ADP+Pi (adenosine diphosphate and phosphate group). Maintaining the availability of ATP for muscle contraction is the limiting factor, since ATP is not stored in large amounts in skeletal muscle.

Detailed explanation-4: -Complete answer: The direct source of energy for muscular contraction is ATP and creatinine. ATP binds to myosin after which it is hydrolyzed to release energy. This energy is utilized by myosin to reach its high-energy state to separate from the active site of the actin filament causing contraction.