The Muscular System: Neuromuscular Junction
1. What insulates each muscle cell? _________________________
2. Synaptic vesicles in the axon terminal of a motor neuron contain what
neurotransmitter? _________________________
3. An action potential in the axon terminal of a motor neuron opens what type
of ion channels? _________________________
4. By what means of membrane transport does the neurotransmitter leave the
axon terminal? _________________________
5. Binding of neurotransmitter to the receptors on the motor endplate open
what type of ion channels? _________________________
6. Opening of these channels leads to _______________ of the motor endplate.
7. How is the neurotransmitter removed from the synaptic cleft?
8. As a result of question 6, an action potential is propagated along the
_________________ of the muscle cell and down the _______________
into the cell.
9. The result of this action potential releases what ion from the terminal
cisternae? ________
10. a. What effect did molecule “X” in the quiz have on the muscle contraction?
b. Explain its mechanism of action.
c. What drug did molecule “X” act like? _______________
11. a. What effect did molecule “Y” have on the muscle contraction?
b. Explain its mechanism of action.
c. What drug did molecule “Y” act like? _______________
