Locomotion and Movement Question 9
9. Characteristics of smooth muscle fibres are
[1990]
(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, striated, multinucleate and voluntary
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Answer : a
Hints & Solutions
(a) Characteristics of smooth muscle fibres.
- cells range from 5 to $10 \mu m$ in diameter and 30 to $200 \mu m$ in length
- spindle-shaped
- single, centrally located nucleus
- smooth muscle tissue occuring within almost every organ, forming sheets, bundles or sheaths around other tissues. Smooth muscle differs from both skeletal and cardiac muscle tissues in structure and function. Sarcomeres or myofibrils are not present - therefore not striated, ie. smooth.
