29. Inhibitory synapses on the input regions of neurons in central nervous syste

Question

29. Inhibitory synapses on the input regions of neurons in central nervous system:
a. increase the number of EPSPs that are needed to summate at the trigger zone to reach threshold. b. decrease the period of time during which EPSPs can summate.
c. decrease the amplitudes of EPSPs reaching the trigger zone.
d. increase the amplitude of EPSPs reaching the trigger zone.
e. all except d are correct.

30. Cutting the vagus nerve (Cranial nerve X) would cut:
a. conductile regions of preganglionic sympathetic neurons.
b. conductile regions of postganglionic sympathetic neurons.
c. output regions of postganglionic sympathetic neurons.
d. conductile regions of postganglionic parasympathetic neurons.

e. conductile regions of preganglionic parasympathetic neurons.

31. For a neuron or muscle cell at rest, the concentration of __ is higher __________ than ______.

a. Na+, in the extracellular space, inside the cell
b. K+, inside the cell, in the extracellular space
c. K+, in the extracellular space, inside the cell

d. Na+, inside the cell, in the extracellular space

e. a and b are correct.

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25. You would predict that electrical stimulation of two neighboring neurons in the left precentral gyrus

would cause:
a. muscle contractions in widely different areas of the left side of the body.
b. sensory sensations perceived as coming from widely different areas right side of the body.
c. sensory sensations perceived as coming from nearly the same area on the right side of the body.

d. muscle contractions in nearly the same region on the right side of the body.
e. muscle contractions in nearly the same region of the body on the left side of the body.

Explanation / Answer

29. ( C) decrease the amplitudes of EPSPs reaching the trigger zone.

30.(B)  conductile regions of postganglionic sympathetic neurons.

31.( e) . a and b are correct.

25.( D) muscle contractions in nearly the same region on the right side of the body.

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