Muscle Mastery
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Questions and Answers

Where is cardiac muscle found?

  • GI tract
  • Heart (correct)
  • Tongue
  • Bones and joints
  • What is the motility function of cardiac muscle?

  • Pacing in SA node
  • Conduction of electrical activity
  • Contraction of atria and ventricles (correct)
  • Closing of valves
  • What is the cellular structure of cardiac muscle?

  • Mononucleated cells (correct)
  • Branching strands
  • Large multinucleated cells
  • Contain gap junctions
  • What is the function of intercalated disks in cardiac muscle?

    <p>Contain gap junctions</p> Signup and view all the answers

    What is the ratio of actin to myosin in cardiac sarcomeres?

    <p>3:1</p> Signup and view all the answers

    What is the main energy metabolism pathway in cardiac muscle?

    <p>Oxidative metabolism</p> Signup and view all the answers

    What is the effect of catecholamines on cardiac contraction?

    <p>Positive inotropy</p> Signup and view all the answers

    How do cardiac action potentials differ from skeletal action potentials?

    <p>Different in different regions of the heart</p> Signup and view all the answers

    How does cardiac muscle contraction differ from skeletal muscle contraction?

    <p>Contract coincident with action potential</p> Signup and view all the answers

    Can cardiac muscle be tetanized?

    <p>No</p> Signup and view all the answers

    Which type of muscle is innervated by the autonomic nervous system and is sensitive to hormones like epinephrine?

    <p>Cardiac muscle</p> Signup and view all the answers

    Which type of muscle does not contract on its own and is insensitive to hormones on a short-time basis?

    <p>Skeletal muscle</p> Signup and view all the answers

    Which type of muscle is found in the GI tract, vascular system, pulmonary system, skin, urinary tract, and reproductive system?

    <p>Smooth muscle</p> Signup and view all the answers

    Which type of muscle has small distinct cells that are mononucleated and elongated in a 'football' shape?

    <p>Smooth muscle</p> Signup and view all the answers

    Which type of muscle has no sarcomeres, no t-tubules, and rarefied SR?

    <p>Smooth muscle</p> Signup and view all the answers

    Which type of muscle contracts in all dimensions as opposed to linear contraction in skeletal and cardiac muscle?

    <p>Smooth muscle</p> Signup and view all the answers

    Which type of smooth muscle has cells that act independently and few gap junctions?

    <p>Multiunit smooth muscle</p> Signup and view all the answers

    Which type of smooth muscle has cells that contract together and many gap junctions?

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

    Which type of muscle relies on Ca++ from outside and some from the SR for excitation-contraction coupling?

    <p>Smooth muscle</p> Signup and view all the answers

    Which type of muscle requires dephosphorylation of myosin via phosphatase activity for relaxation?

    <p>Skeletal muscle</p> Signup and view all the answers

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