Energy for contraction of myocardial cells comes primarily from
A)aerobic respiration in the mitochondria.
B)anaerobic respiration in the cytosol.
C)glycolysis in the cytosol.
D)ATP that is stored while the heart is not contracting.
E)creatine phosphate.

Question

Quizplus · Accepted Answer

Myocardial cells primarily rely on aerobic respiration in the mitochondria to generate energy for contraction. This is because the heart requires a constant supply of energy, and aerobic respiration is the most efficient way to generate ATP. Anaerobic respiration, glycolysis, and creatine phosphate can also contribute to energy production, but to a much lesser extent than aerobic respiration. ATP that is stored while the heart is not contracting is not a significant source of energy during contraction.

Energy for Contraction of Myocardial Cells Comes Primarily from