A postsynaptic neuron has three presynaptic inputs - from neurons X, Y, and Z

Stimulation of neuron X causes the postsynaptic neuron to depolarize by 0.5 mV. When X and Y are stimulated simultaneously, the postsynaptic neuron depolarizes by 1 mV. When X and Z are stimulated simultaneously, however, there is no change in the membrane potential of the postsynaptic neuron. What is most likely true about presynaptic neurons Y and Z?
A. They are both excitatory.
B. They are both inhibitory.
C. Y is excitatory and Z is inhibitory.
D. Z is excitatory and Y is inhibitory.


C

Anatomy & Physiology

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What type of neuronal synapse occurs between cardiac muscle cells?

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The anterior pituitary gland develops from the embryonic pharynx.

Answer the following statement true (T) or false (F)

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