EXERCISES, LESSON 3
INSTRUCTIONS: Answer the following exercises by marking the lettered response
which best answers the question.
After you have completed all the exercises, turn to "Solutions to Exercises" at the end of
the lesson, and check your answers. For each exercise answered incorrectly, reread
the material referenced with the solution.
Select the best definition of the term muscle relaxant.
An agent that prevents the transmission of any nerve impulses.
An agent that causes a patient to become less anxious.
An agent that reduces skeletal muscle tone.
An agent that causes muscles to be relaxed because it increases the
amount of acetylcholine present at the neuromuscular junction.
Which of the following statements best describes the mechanism of action of
neuromuscular blocking agents?
They decrease muscle tone by depressing the internuncial neurons at
the spinal cord.
They block the action of acetylcholine at the neuromuscular junction or
at the muscle receptor site.
They act on the terminal knob to cause a release of acetylcholine at the
neuromuscular junction to produce the depolarization of the receptor site.
They cause a great influx of sodium into the muscle receptor site and a
great influx of potassium out of the receptor site in order to make the muscle become
Centrally acting skeletal muscle relaxants act by:
Decreasing the muscle tone by depressing the internuncial neurons at
the spinal cord.
Blocking the action of acetylcholine at the neuromuscular junction or the
muscle receptor site.
Causing the sodium and potassium at the receptor site to flow into and
out of the area.
Destroying the acetylcholine at the neuromuscular junction.