Describe the events that occur at a skeletal neuromuscular junction
What will be an ideal response?
Action potential occurs in the motor neuron; calcium enters motor neuron; axon terminal triggers release of acetylcholine; acetylcholine binds to receptors on the motor end plate; Na+ channels open/Na+ enters the cell, and K+ channels open/K+ leaves the cell, creating a depolarizing end plate potential; local depolarizing current flow continues, and opens voltage-gated Na+ channels in adjacent membrane; cell reaches threshold and initiates an action potential. Acetylcholine is subsequently destroyed by acetylcholinesterase, an enzyme located on the motor end plate.
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Extensions of the plasma membrane that increase surface area for the absorption of nutrients in the small intestine are called __________.
Fill in the blank(s) with the appropriate word(s).
The types of neurons that carry impulses away from the brain and spinal cord are called:
a. motor neurons b. sensory neurons c. efferent neurons d. both A and C above
Which of the following muscles depresses the ribs in respiration?
A) internal intercostals B) external intercostals C) scalenes D) none of the above Feedback: Correct Answer
During exercise, the energy necessary to sustain skeletal muscle cell contraction comes from
A. increased insulin production. B. increased epinephrine and glucagon release. C. decreased sympathetic nervous system activity. D. storing glucose as glycogen. E. conservation of glucose.