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Question

Muscles with characteristic striations and involuntary are

(a) muscles in the wall of alimentary canal

(b) muscles of the heart

(c) muscles assisting locomotion

(d) muscles of the eyelids


Solution

(b) muscles of the heart.

Cardiac muscle fibres are supplied with both central and autonomic nervous system and are not under the control of the will of the organisms, i.e., they are involuntary. These muscles possess striation but they never get fatigued as the myofibrils of heart have transverse faint dark and light bands which alternate with each other giving them striped appearence.

While muscles of the wall of alimentary canal are smooth muscle, i.e., non-striated and involuntary, muscle assisting locomotion, i.e., skeletal muscles are striated and voluntary and muscles of eyelid are involuntary but striations muscles this the other options are wrong.


Biology
NCERT Exemplar
Standard XI

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