Question

The muscles immune to fatigue are:

• A. Striped
• B. Non-striped
• C. Cardiac
• D. None of the above

Answer 1

The correct option is C Cardiac

• Fatigue can be as a result of vigorous exercise but abnormal fatigue may be caused by barriers to or interference with the different stages of muscle contraction.
• Cardiac muscle is highly resistant to fatigue due to the presence of a large number of mitochondria, myoglobin and a good supply of oxygen, allowing continuous aerobic metabolism.
• Its refractory period (a period immediately following stimulation during which a nerve or muscle is unresponsive to further stimulation) is very long. It is an important cause behind not being fatigued.
• Thus, the correct answer is option C.