Muscles which are immune to fatigue are

Options

(a) unstriped muscle
(b) cardiac muscle
(c) jaw muscle
(d) skeletal muscle

Correct Answer:

cardiac muscle

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. Fibres of these muscle contain large number of mitochondria.