Cardiac muscle cells
A)have smooth ER but no T tubules.
B)form the heart valves.
C)are maintained by an extensive capillary network.
D)develop a significant oxygen debt during systole.
E)do not contain actin and myosin like skeletal muscle cells.

Question

Quizplus · Accepted Answer

Cardiac muscle cells require a constant supply of oxygen and nutrients due to their high energy demands. This is facilitated by an extensive capillary network that surrounds and supports the cells. The other options are incorrect: A) Cardiac muscle cells do have T tubules, which help to distribute the action potential throughout the cell. B) Cardiac muscle cells do not form heart valves; those are made up of connective tissue. D) Cardiac muscle cells do not develop significant oxygen debt during systole because they rely primarily on aerobic respiration. E) Cardiac muscle cells do contain actin and myosin, which are responsible for contraction.

Cardiac Muscle Cells