Mastering the Basics of Smooth Muscle
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Questions and Answers

Smooth muscle cells have different physical dimensions in order to

  • respond to different stimuli
  • receive nerve signals
  • facilitate coordinated contractions
  • adapt to different organs (correct)

    • Smooth muscle cells are organized into bundles or sheets to

  • adjust to different organs
  • respond to different stimuli
  • receive nerve signals
  • enable coordinated contractions (correct)

    • Smooth muscle cells respond to different stimuli, including

  • neural, hormonal, and local factors (correct)
  • hormonal and local factors
  • O2, CO2, and H2
  • neural and hormonal factors

    • Smooth muscle cells receive nerve signals from the

    <p>autonomic nervous system</p> Signup and view all the answers

    Smooth muscle cells adjust their physical dimensions to

    <p>fit the specific organs they are in</p> Signup and view all the answers

    The organization of smooth muscle cells into bundles or sheets allows for

    <p>coordinated contractions</p> Signup and view all the answers

    Smooth muscle cells can respond to a variety of stimuli, including

    <p>neural, hormonal, and local factors</p> Signup and view all the answers

    Smooth muscle cells receive nerve signals from the

    <p>autonomic nervous system</p> Signup and view all the answers

    Smooth muscle cells adjust their physical dimensions to

    <p>fit the specific organs they are in</p> Signup and view all the answers

    The organization of smooth muscle cells into bundles or sheets allows for

    <p>coordinated contractions</p> Signup and view all the answers

    Smooth muscle is found in which of the following organs?

    <p>Uterus</p> Signup and view all the answers

    Which type of smooth muscle contracts as a single unit?

    <p>Single-unit smooth muscle</p> Signup and view all the answers

    Which type of smooth muscle has discrete, separate muscle fibers?

    <p>Multi-unit smooth muscle</p> Signup and view all the answers

    Which type of smooth muscle is found in the ciliary muscles of the eyes?

    <p>Multi-unit smooth muscle</p> Signup and view all the answers

    What is the arrangement of actin and myosin filaments in smooth muscle?

    <p>Random arrangement</p> Signup and view all the answers

    What is the major source of Ca2+ for smooth muscle contraction?

    <p>Extra cellular fluid</p> Signup and view all the answers

    How much can smooth muscle contract compared to skeletal muscle?

    <p>80% of its length</p> Signup and view all the answers

    What is the energy requirement to maintain the contraction of smooth muscle compared to skeletal muscle?

    <p>1/10 to 1/300</p> Signup and view all the answers

    Which of the following is a location where single-unit smooth muscle is found?

    <p>Uterus</p> Signup and view all the answers

    What is the function of smooth muscle in the body?

    <p>All of the above</p> Signup and view all the answers

    Which of the following is true about smooth muscle fibers?

    <p>Some larger smooth muscle cells have caveolae near the cell membrane.</p> Signup and view all the answers

    What is the role of caveolae in smooth muscle fibers?

    <p>They excite calcium release from the sarcoplasmic reticulum (SR).</p> Signup and view all the answers

    How does smooth muscle contraction differ from skeletal muscle contraction?

    <p>Smooth muscle uses calmodulin as a calcium-binding protein.</p> Signup and view all the answers

    What is the role of activated calmodulin in smooth muscle contraction?

    <p>It activates myosin light chain kinase (MLCK).</p> Signup and view all the answers

    What happens when myosin is phosphorylated in smooth muscle contraction?

    <p>It binds to actin, forming a cross-bridge.</p> Signup and view all the answers

    What is the role of myosin phosphatase in smooth muscle relaxation?

    <p>It removes phosphate from the myosin light chain.</p> Signup and view all the answers

    Which factor determines the rate of contraction in smooth muscle fibers?

    <p>The extent of the sarcoplasmic reticulum (SR).</p> Signup and view all the answers

    What is the role of calmodulin in smooth muscle contraction?

    <p>It phosphorylates myosin.</p> Signup and view all the answers

    Which protein is responsible for phosphorylating myosin in smooth muscle contraction?

    <p>Myosin light chain kinase (MLCK)</p> Signup and view all the answers

    What is the effect of reducing calcium ion concentration in smooth muscle?

    <p>It causes muscle relaxation.</p> Signup and view all the answers

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