Multiple choice

Which of the following statements regarding smooth muscle fibres is correct?

  1. These are innervated by autonomic nerves similar to the neuromuscular junction of skeletal muscle.

  2. All smooth muscles of the body act as a single motor unit.

  3. Some smooth muscles also get contracted in absence of an action potential.

  4. They never form the part of circulatory system.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Smooth muscle fibers have a fusiform shape and, like striated muscle, can tense and relax. Some smooth muscles have the ability to contract spontaneously, i.e., it contracts without any external stimulation.

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