Characteristics of smooth muscle fibres are that they are:
Correct answer: A. Spindle shaped, unbranched, nonstriated, uninucleate and involuntary
- A. Spindle shaped, unbranched, nonstriated, uninucleate and involuntary
- B. Spindle shaped, unbranched, unstriped, multinucleate and involuntary
- C. Cylindrical, unbranched, unstriped, multinucleate and involuntary
- D. Cylindrical, unbranched, striated, multinucleated and voluntary
Explanation
The smooth muscle consists of long, narrow unbranched spindle-shaped fibres. Each fibre contains a single oval nucleus in its thick middle part. The cross striations are absent so that the fibres look smooth, hence the name nonstriated. Its contraction is not under the control of the animal, therefore, also called involuntary muscle.
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About Support and Movement
Support and movement covers the axial and appendicular skeleton, bone structure, joints and the arrangement of skeletal muscles. Muscle contraction is explained through actin, myosin, sliding filaments, calcium ions and ATP, while arthritis is distinguished as a disorder of joints rather than a normal part of movement.
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