Question

Characteristics of smooth muscle fibres are

(a) spindle-shaped, unbranched, unstriated, uninucleate and involuntary

(b) spindle-shaped, unbranched, unstriped, multinucleate and involuntary

(c) cylindrical, unbranched, unstriped, multinucleate and involuntary

(d) cylindrical, unbranched, unstriated, multinucleate and voluntary

Answer 1

Correct option (a) spindle-shaped, unbranched, unstriated, uninucleate and involuntary

Explanation

Smooth muscle fibres are spindle-shaped, thick in the middle and thin at either ends, uninucleated, no sarcolemma, contraction is slow, involuntary under the control of autonomous nervous system. These muscles are also known as visceral muscles, non-striated non-skeletal or involuntary muscles.