Test your knowledge of the unique characteristics of cardiac muscle fibers with...
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Questions and Answers

What gives individual cardiac muscle fibers a 'stair-step' appearance?

  • Nuclei distribution
  • Branching (correct)
  • Circular shape
  • Length

    • What is the typical length of a cardiac muscle fiber?

  • 100–150μm
  • 20–50μm
  • 50–100μm (correct)
  • 150–200μm

    • What is the approximate diameter of a cardiac muscle fiber?

  • 10μm
  • 14μm (correct)
  • 20μm
  • 25μm

    • What connects the ends of cardiac muscle fibers to neighboring fibers?

    <p>Intercalated discs</p> Signup and view all the answers

    What occupies 25% of the cytosolic space in a cardiac muscle fiber?

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

    What is the primary function of intercalated discs in cardiac muscle fibers?

    <p>To hold the fibers together and allow muscle action potentials to conduct</p> Signup and view all the answers

    What is the approximate percentage of cytosolic space occupied by mitochondria in cardiac muscle fibers?

    <p>25%</p> Signup and view all the answers

    How do cardiac muscle fibers differ from skeletal muscle fibers in terms of length and shape?

    <p>Shorter in length and less circular in transverse section</p> Signup and view all the answers

    What is the primary role of gap junctions in cardiac muscle fibers?

    <p>Allow muscle action potentials to conduct from one muscle fiber to its neighbors</p> Signup and view all the answers

    What is the typical diameter of a cardiac muscle fiber?

    <p>About 14μm</p> Signup and view all the answers

    What is the approximate percentage of cytosolic space occupied by mitochondria in cardiac muscle fibers?

    <p>25%</p> Signup and view all the answers

    What is the typical length of a cardiac muscle fiber?

    <p>50–100m</p> Signup and view all the answers

    What is the primary function of intercalated discs in cardiac muscle fibers?

    <p>To hold the muscle fibers together</p> Signup and view all the answers

    What is the approximate diameter of a cardiac muscle fiber?

    <p>14m</p> Signup and view all the answers

    What gives individual cardiac muscle fibers a 'stair-step' appearance?

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

    What is the primary function of intercalated discs in cardiac muscle fibers?

    <p>To hold the fibers together</p> Signup and view all the answers

    What is the significance of the larger and more numerous mitochondria in cardiac muscle fibers?

    <p>They provide energy for constant muscle contraction</p> Signup and view all the answers

    What allows the entire myocardium of the atria or the ventricles to contract as a single, coordinated unit?

    <p>Gap junctions</p> Signup and view all the answers

    What is the approximate length of a typical cardiac muscle fiber?

    <p>50–100μm</p> Signup and view all the answers

    What is the characteristic feature of the ends of cardiac muscle fibers connecting to neighboring fibers?

    <p>Irregular transverse thickenings called intercalated discs</p> Signup and view all the answers

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