Question

Smooth muscle fibres are:

• A. cylindrical, unbranched, striated, multinucleate and voluntary
• B. spindle- shaped, unbranched, non-striated, uninucleate and involuntary
• C. cylindrical, unbranched, non-striated, multinucleate and involuntary
• D. spindle-shaped, unbranched, striated, uninucleate and voluntary

Answer 1

Answer: (B)

spindle- shaped, unbranched, non-striated, uninucleate and involuntary

Answer 2

There are three types of muscular tissues - cardiac, smooth and skeletal. The smooth muscle fibers are found in the walls of the hollow visceral organs like pancreas, liver and intestine. The main function of the smooth muscle fibers is contraction. They are spindle-shaped and involuntary. The thin and thick filaments in smooth muscle fibers are not arranged into sarcomeres, resulting in a non-striated appearance. These fibers contains only one nucleus. Hence, option B is correct.