MUSCLE PHYSIOLOGY

Detailed explanation-1: -Carbohydrate is the only fuel that can be used for both aerobic and anaerobic ATP production, and both systems are activated very quickly during transitions from rest to exercise and from one power output to a higher power output.

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

Detailed explanation-3: -The source of energy that is used to power the movement of contraction in working muscles is adenosine triphosphate (ATP) – the body’s biochemical way to store and transport energy.

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.

Detailed explanation-5: -Adenosine triphosphate (ATP) is the sole fuel for muscle contraction. During near maximal intense exercise the muscle store of ATP will be depleted in < 1s, therefore, to maintain normal contractile function ATP must be continually resynthesized.