Energy for contraction of cardiac muscle 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.

Aerobic Respiration

The process of producing cellular energy involving oxygen. It's used by cells to convert glucose into energy.

Cardiac Muscle Cells

Specialized, striated muscle cells found in the heart, responsible for pumping blood throughout the body through involuntary contractions.

Mitochondria

Organelles found in the cytoplasm of eukaryotic cells that are involved in energy production through the process of oxidative phosphorylation.