Question

The muscle which works throughout life without undergoing fatigue is________________.

• A. Striated muscle
• B. Non-striated muscle
• C. Cardiac muscle
• D. All of the above

Answer 1

The correct option is C Cardiac muscle

Striated muscles are present in limbs as arms and legs. These muscles are controlled by conscious will. The limb movement is triggered or controlled (started or stopped) by a person's will.
Non-striated muscles are also called as smooth muscles, which are not under control of the conscious will. These muscles are present in the alimentary canal, urinary bladder, bronchi of lungs, etc. Processes as digestion by alimentary canal, urine storage in the urinary bladder, air intake by bronchi happens in the body without any knowledge to the person. Hence, these are involuntary processes.
Cardiac muscles are involved in the pumping of blood through the heart and to transport to all body tissues. This process is carried out in the body all the time. Through this process, oxygen is supplied to all body tissues, which is necessary for survival. As the refractory period of cardiac muscle is high, it does not get fatigued. Therefore, cardiac muscles work all the time throughout life without undergoing fatigue. Hence, option C is correct.