Smooth Muscle Physiology Quiz

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Questions and Answers

What is the primary function of smooth muscles?

  • Movement of joints (correct)
  • Supporting the skeleton
  • Generating heat for the body
  • Enabling fine motor skills

Which type of smooth muscle has individual fibers that can contract independently?

  • Visceral smooth muscle
  • Syncytial smooth muscle
  • Unitary smooth muscle
  • Multiunit smooth muscle (correct)

Where are examples of multiunit smooth muscles found?

  • Stomach muscles
  • Intestinal muscles
  • Biceps muscles
  • Ciliary muscles of the eye (correct)

What do smooth muscles contain that are similar to those in skeletal muscles?

<p>Actin and myosin filaments (B)</p> Signup and view all the answers

How do unitary smooth muscles contract?

<p>Together as a single unit (B)</p> Signup and view all the answers

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Study Notes

Smooth Muscles

  • The primary function of smooth muscles is to create movements in hollow organs, such as the digestive tract, blood vessels, and airways.
  • Unitary smooth muscles have fibers that are electrically coupled, allowing them to contract as a single unit.
  • Multiunit smooth muscles, on the other hand, have individual fibers that can contract independently, allowing for more precise control; examples of these can be found in the iris of the eye, the skin, and blood vessels.
  • Smooth muscles contain tropomyosin and troponin, similar to those found in skeletal muscles, which play a key role in muscle contraction.
  • Unitary smooth muscles contract through the slow and sustained contraction of multiple fibers, allowing for long-term contractions.

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