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
You might also like to view...
What type of neuronal synapse occurs between cardiac muscle cells?
A. Physical synapse B. Magnetic synapse C. Chemical synapse D. Mechanical synapse E. Electrical synapse
The anterior pituitary gland develops from the embryonic pharynx.
Answer the following statement true (T) or false (F)
If an element from the first column of the periodic table entered into a covalent bond with one from the sixth column, then the bond would be a
A. polar bond, with the element from the first column developing a partial negative charge.?B. polar bond, with the element from the sixth column developing a partial negative charge.?C. nonpolar bond, with the element from the first column developing a partial positive charge.?D. nonpolar bond, with the element from the sixth column developing a partial positive charge.?E. nonpolar bond, with neither element developing any partial charges at all.
Dehydration is caused by
A) prolonged vomiting or prolonged diarrhea. B) excessive sweating. C) prolonged water deprivation. D) all of the above.