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Chapter 11: Fundamentals of the Nervous System (Part 1)

front 1

All of the following might synapse with each other EXCEPT

back 1

Cell body with cell body.

front 2

The number of processes extending from their cell body can classify neurons structurally. Which is the most common neuron type in humans?

back 2

Multipolar.

front 3

Somatic sensory afferents transmit impulses from the _________to the CNS.

back 3

The skin.

front 4

The interior of a nerve cell has a slight excess of negative charge because

back 4

potassium diffuses out of the cell.

front 5

The Nissl bodies seen in the neuron cell body represents which cellular organelle?

back 5

Rough endoplasmic reticulum.

front 6

Tracts in the CNS correspond to ____________ in the PNS.

back 6

nerves.

front 7

Which of the following statements best describes the membrane situation in the resting state in the neuron?

back 7

All the voltage-gated Na+ and K+ channels are closed.

front 8

Which of the following line the central cavities of the brain and spinal cord and provides a barrier between the CSF and nervous tissue?

back 8

Ependymal cells.

front 9

Which of the following characteristics is NOT associated with a myelinated nerve fiber?

back 9

Slow conduction of nerve impulses.

front 10

Which of the following events is NOT involved in the transfer of information across a chemical synapse?

back 10

Direct flow of ions from one neuron to the next.

front 11

Which of the following electrical events occurs when a certain threshold is reached?

back 11

Action potential.

front 12

Which of the following factors is associated with increased conduction velocity in an axon?

back 12

Large diameter.

front 13

Which of the following is characteristic of the action of an IPSP but NOT in an EPSP?

back 13

Hyperpolarization is produced which spreads to the axon hillock.

front 14

A potential -90 mV would be considered to be

back 14

hyperpolarized.

front 15

During which phase of an action potential are voltage-gated K+ channels open, while voltage gated Na+ channels are closed?

back 15

Repolarizing phase.

front 16

Which of the following neurotransmitters acts as a natural opiate?

back 16

Endorphins

front 17

Which of the following statements concerning developmental aspects of neurons is INCORRECT?

back 17

The adult number of neurons is the same as those originally formed during the embryonic period.

front 18

Spatial summation occurs when

back 18

multiple local potentials occur at different places on the same cell at the same time.

front 19

Which of the following statements concerning inhibitory synapses (IPSP) is correct?

back 19

Postsynaptic membrane becomes more permeable to potassium and chloride.

front 20

Which of the following is NOT a biogenic amine neurotransmitter?

back 20

Acetylcholine.

front 21

Which of the following neuroglia is most responsible for the blood-brain barrier?

back 21

Astrocytes.

front 22

Which of the following types of neurons is found in the retina of the eye?

back 22

Bipolar.

front 23

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back 23

Thanks.