Which of the following is not a feature of cardiac muscle?
A) They depend almost exclusively on aerobic respiration.
B) They are rich in glycogen.
C) They have larger than average mitochondria.
D) They are very rich in myoglobin.
E) They have about the same endurance as skeletal muscle fibers.

Question

Quizplus · Accepted Answer

Cardiac muscle fibers have a high endurance due to their reliance on aerobic respiration, large mitochondria, and richness in myoglobin, which are adaptations for continuous activity without fatigue. This contrasts with skeletal muscle fibers, which can vary widely in endurance based on their type (e.g., fast-twitch vs. slow-twitch).

Which of the Following Is Not a Feature of Cardiac