MICROANATOMY

Detailed explanation-1: -Final Answer: The muscles which are immune to fatigue are Cardiac muscles.

Detailed explanation-2: -Cardiac muscle resists fatigue so well because it’s got more mitochondria than skeletal muscle. With so many power plants at its disposal, the heart doesn’t need to stop and chill out. It also has a steady supply of blood bringing it oxygen and nutrients.

Detailed explanation-3: -Unlike other muscle cells in the body, cardiomyocytes are highly resistant to fatigue. True, cardiomyocytes are primarily powered by mitochondria (the energy house of the cell), similar to your other muscles. However, cardiomyocytes have as much as 10 times the density of mitochondria, skyrocketing their energy output.

Detailed explanation-4: -Smooth muscles and cardiac muscles come under involuntary muscles. Cardiac muscles are only found in heart. They relaxes and contracts rapidly and rhythmically regularly without any fatigue.

Detailed explanation-5: -Explanation: Cardiac muscle tissues occur only in heart. This muscle is controlled involuntarily and continue in function without being stimulated by nerve impulse. Cardiac muscle contracts quickly but in never gets fatigued because it rests and work for equal duration. So, the correct answer is, ‘Cardiac’.