Question 1

An action potential is triggered if

Accepted Answer

A)  EPSPs overpower IPSPs.
B)  IPSPs overpower EPSPs.
C)  chloride channels open.
D)  the membrane hyperpolarizes.

Question 2

Each neuron in the CNS may receive input from

Accepted Answer

A)  only one synaptic knob.
B)  one synaptic knob at each end.
C)  about 10 dendrites.
D)  thousands of axons.

Question 3

Every neuron has

Accepted Answer

A)  many axons.
B)  a cell body.
C)  myelin.
D)  a neurilemma.

Question 4

The cytoplasmic extensions that,together with the cell body,provide the main receptive surfaces for neurons are

Accepted Answer

A)  neurofibrils.
B)  chromatophilic substance (Nissl bodies) .
C)  axons.
D)  dendrites.

Question 5

The most rapid conduction of an impulse along an axon occurs on a fiber that is

Accepted Answer

A)  thick and myelinated.
B)  thick and unmyelinated.
C)  thin and myelinated.
D)  thin and unmyelinateD.

Exam 10: Nervous System I

The cytoplasmic extensions that,together with the cell body,provide the main receptive surfaces for neurons are