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anatomy and physisiology chapter 11 review questions

front 1

Which of the following structures is not part of the central nervous system?

brain, nerve, spinal cord, tract

back 1

a nerve

front 2

Myelinates nerve fibers in the cns

back 2

oligodendrocyte

front 3

Lines brain cavities

back 3

ependymal cell

front 4

Myelinates nerve fibers in the pns

back 4

schwann cells

front 5

cns phagocytes

back 5

microglia

front 6

Helps regulate the ionic composition of cns extracellular fluid

back 6

astrocyte

front 7

What type of current flows through the axolemma during the steep phase of repolarization?

back 7

chiefly a potassium current

front 8

Assume that an epsp is being generated on the dendritic membrane. which will occur?

a.specific Na+ channels will open
b.specific K+ channels will open
c.a single type of channel will open, permitting simultaneous flow of Na+ and K+.
d. Na+ channels will open first then close as K+ channels open.

back 8

I single channel will open permitting simultaneous flow of Na+ and K+

front 9

The velocity of nerve impulse conduction is greatest in?
a.heavily myelinated large diameter fibers
b.myelinated small diameter fibers
c.unnmyelinated small diameter fibers
d.unmyelinated large diameter fibers

back 9

heavily myelinated large diameter fibers

front 10

Chemical synapse are characterized by all of the following except?
a.the release of a neurotransmitter by the presynaptic membrane
b.postsynaptic membranes bearing receptors that bind neurotransmitters
c.ions flowing through protein channels from the presynaptic to the post synaptic neuron
d.a fluid filled gap separating the neurons

back 10

ions flowing through channels form the presynaptic to the postsynaptic neuron

front 11

Biogenic amine neurotransmitters include all of the following except?

a.norepinephrine
b.acetylcholine
c.dopamine
d.serotoni

back 11

acetylcoline

front 12

The neuropeptides that act as natural opiates are?

back 12

enkephalins

front 13

Inhibition of acetylcholinesterase by poisoning blocks neurotransmission at the neuromuscular junction because?

back 13

ACh is not degraded hence prolonged depolarization is is enforced on the postsynaptic cell.

front 14

The anatomical region of a multipolar neuron that has the lowest threshold for generating an AP (action potential) is the?

back 14

axon hillock

front 15

An IPSP is inhibitory because?

back 15

it hyperpolarizes the postsynaptic membrane

front 16

Impulses continue around and around a circuit until one neuron stops firing

back 16

reverberating

front 17

One or a few input ultimately influence large numbers of neurons

back 17

diverging

front 18

Many neurons influence a few neurons

back 18

converging

front 19

May be involved in exacting types of mental activity

back 19

parallel after-discharge