Why is blockage of a coronary artery such a serious threat to cardiac muscle?

A. Cardiomyocytes rely on a constant supply of calcium.
B. Cardiomyocytes have abundant mitochondria and rely on a constant supply of oxygen.
C. The myosin of cardiomyocytes is unique and requires abundant nutrients and oxygen.
D. Cardiomyocytes have weak sarcolemmas that easily rupture.
E. Cardiomyocytes are fast-twitch fibers.


Answer: B

Anatomy & Physiology

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