Muscular Tissue and Muscle Fibers
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Questions and Answers

What is the function of glycogen granules and lipid droplets in the sarcoplasm?

  • To synthesize proteins for the muscle
  • To provide structural support to the myofibril
  • To serve as energy sources (correct)
  • To regulate the contraction of the muscle
  • What is the function of the M-line in the sarcomere?

  • To connect the thick filaments together in a transverse direction (correct)
  • To regulate the contraction of the muscle
  • To provide structural support to the myofibril
  • To anchor the thin filaments to the z-line
  • What is the characteristic of cardiac muscle fibers?

  • They are striated and voluntary
  • They are striated and involuntary (correct)
  • They are smooth and involuntary
  • They are smooth and voluntary
  • What is the length of the sarcomere?

    <p>2-3 um</p> Signup and view all the answers

    What is the function of the sarcoplasmic reticulum?

    <p>To store and release calcium ions for muscle contraction</p> Signup and view all the answers

    What is the characteristic of the sarcoplasmic reticulum in cardiac muscle cells?

    <p>It is less abundant and runs the whole length of the sarcomeres without fenestrated cisternae at the H-band</p> Signup and view all the answers

    What is the shape of the nucleus in smooth muscle fibers?

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

    What is the function of the intercalated discs in cardiac muscle cells?

    <p>To facilitate the transmission of electrical signals between cells</p> Signup and view all the answers

    What is the characteristic of the transverse tubules in cardiac muscle cells?

    <p>They run at the level of the Z-line</p> Signup and view all the answers

    What is the significance of the caveolae in smooth muscle fibers?

    <p>They facilitate the contact between the sarcolemma and the SER cisternae</p> Signup and view all the answers

    What is the characteristic of the nuclei in skeletal muscle fibers?

    <p>Elongated and peripheral</p> Signup and view all the answers

    What type of connective tissue surrounds the whole muscle?

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

    What is the characteristic of the cytoplasm in skeletal muscle fibers?

    <p>Acidophilic and shows transverse striations</p> Signup and view all the answers

    What is the function of the elaborate membrane system around myofibrils in skeletal muscle fibers?

    <p>Smooth endoplasmic reticulum</p> Signup and view all the answers

    What is the shape of the skeletal muscle fibers in transverse section?

    <p>Polygonal and rounded</p> Signup and view all the answers

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