The main energy source or fuel for skeletal muscle contraction is:
A) calcium.
B) lactic acid.
C) ATP.
D) actin.

Question

Quizplus · Accepted Answer

ATP (adenosine triphosphate) is the main energy source or fuel for skeletal muscle contraction. When muscles contract, ATP is broken down into ADP (adenosine diphosphate) and inorganic phosphate, releasing energy that is used for muscle contraction. Calcium plays an important role in muscle contraction by binding to troponin, which initiates a series of events that leads to the sliding of actin and myosin filaments. Lactic acid is a byproduct of anaerobic metabolism and can contribute to muscle fatigue but is not the main energy source for muscle contraction. Actin is a protein involved in the sliding of filaments during muscle contraction but is not an energy source.

The Main Energy Source or Fuel for Skeletal Muscle Contraction