Neuromuscular Junction and Acetylcholine Breakdown
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Questions and Answers

What enzyme breaks down acetylcholine in the synaptic cleft?

  • Acetylcholine oxidase
  • Acetylcholinesterase (correct)
  • Acetylcholine kinase
  • Acetyltransferase
  • In what step does acetylcholine degrade at the neuromuscular junction?

  • Step 6 (correct)
  • Step 5
  • Step 4
  • Step 3
  • What happens when acetylcholine binds to its receptor on the ion channel?

  • Ion channel shrinks in size
  • Ion channel opens and allows ions to pass (correct)
  • Acetylcholine breaks down immediately
  • Ion channel closes stopping ion passage
  • Which enzyme is involved in ending the effects of acetylcholine?

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

    What is the role of acetylcholinesterase in the breakdown of acetylcholine?

    <p>It breaks down acetylcholine into its components</p> Signup and view all the answers

    What happens to ions when acetylcholine is degraded at the neuromuscular junction?

    <p>Ions are blocked from passing through ion channels</p> Signup and view all the answers

    Which muscle is the prime mover of plantar flexion in the lower limb?

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

    Which muscle is known as the 'toe dancers' muscles due to its involvement in plantar flexion?

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

    Which muscle group is primarily responsible for foot eversion in the lower limb?

    <p>Fibularis muscles</p> Signup and view all the answers

    What muscle is crucial for toe extension and dorsiflexion of the foot?

    <p>Tibialis anterior</p> Signup and view all the answers

    Which muscle group is responsible for both dorsiflexion and foot inversion in the lower limb?

    <p>Extensor digitorum longus</p> Signup and view all the answers

    What muscle is involved in both plantar flexion and foot eversion?

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

    What is the primary function of the sarcoplasmic reticulum in a skeletal muscle cell?

    <p>Store and release calcium</p> Signup and view all the answers

    Which term refers to the ability of muscle cells to be stretched?

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

    What is the zone within the A band of a skeletal muscle that lacks actin filaments?

    <p>H zone</p> Signup and view all the answers

    Which term refers to the responsiveness of a muscle cell to a stimulus?

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

    What is composed of one motor neuron and all the skeletal muscle cells it stimulates?

    <p>Motor unit</p> Signup and view all the answers

    What serves as the final go signal for muscle contraction?

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

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