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When an action potential occurs in the motor neuron at the neuro-muscular junction, the amplitude of the excitatory post-synaptic potential (EPSP) depends on the concentration of extracellular Ca++ because:
A. The higher the concentration of Ca++, the more Ca++ enters the presynaptic termincal through voltage-gated Ca++ channels.
B. more Ca++ causes more synaptic vesicles to fuse with the membrane of the presynaptic termincal
C. more Ca++ increases the amplitude of MEPPS in the muscle fiber
D. more Ca++ causes hyper-polarization of the neuron membrane
E. more Ca++ inhibits acetylcholine receptors.
F. A & B
G. A, B, & C
H. All of the above
A. The higher the concentration of Ca++, the more Ca++ enters the presynaptic termincal through voltage-gated Ca++ channels.
B. more Ca++ causes more synaptic vesicles to fuse with the membrane of the presynaptic termincal
C. more Ca++ increases the amplitude of MEPPS in the muscle fiber
D. more Ca++ causes hyper-polarization of the neuron membrane
E. more Ca++ inhibits acetylcholine receptors.
F. A & B
G. A, B, & C
H. All of the above
