Skeletal Muscle Functions and Structure

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Questions and Answers

What percentage of the body is comprised of skeletal muscle?

  • 20%
  • 60%
  • 80%
  • 40% (correct)

What is the primary function of skeletal muscle in terms of locomotion?

  • Producing heat
  • Facilitating movement and breathing (correct)
  • Maintaining posture
  • Stabilizing joints

What is required for skeletal muscle to contract?

  • Neuromuscular transmission
  • Hyperpolarization
  • Muscle relaxation
  • Depolarization (correct)

Where does the axon terminal lie in the neuromuscular junction?

<p>In the synaptic gutter (C)</p> Signup and view all the answers

What is the role of Ca++ in neuromuscular transmission?

<p>Facilitating acetyl choline release (D)</p> Signup and view all the answers

What is the result of acetyl choline binding to its receptors on the end plate membrane?

<p>End plate depolarization (D)</p> Signup and view all the answers

What is the primary function of acetyl choline esterase in neuromuscular transmission?

<p>To degrade acetyl choline rapidly, preventing multiple muscle contraction (C)</p> Signup and view all the answers

What is the delay time needed for acetyl choline release, inflow of Na+, and depolarization to firing level?

<p>0.5 msec (C)</p> Signup and view all the answers

Which ion increases neuromuscular transmission?

<p>Ca++ (C)</p> Signup and view all the answers

What is the characteristic of neuromuscular transmission?

<p>It is unidirectional, from nerve to muscle (C)</p> Signup and view all the answers

What is the cause of Myasthenia Gravis?

<p>Presence of curare-like substance in the blood (A)</p> Signup and view all the answers

What is the treatment for Myasthenia Gravis?

<p>Anticholine esterase inhibitors (B)</p> Signup and view all the answers

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