Chapter 12, 13, 14

Question 1

The optic (II) nerve emerges from the brain; therefore, it is a type of

Answer 1

cranial nerve

Question 2

The brachial plexus is a spinal nerve network that serves the muscles of the upper limbs. The brachial plexus is therefore considered part of the

Answer 2

somatic nerve

Question 3

What is primarily found in the white matter of the spinal cord

Answer 3

myelinated axons

Question 4

Which types of CNS neuroglia are the most similar in appearance?

Answer 4

astrocytes and oligodendrocytes

Question 5

Some neurons in the body stretch for several feet. Which of the following is a type of electrical impulse that allows communication over such a distance?

Answer 5

action potential

Question 6

Phenytoin blocks the opening of voltage-gated Na+ channels in neurons. Therefore, this action has its primary effects on which part of the neuron?

Answer 6

axon

Question 7

Cells in the sinoatrial node of the heart have a resting membrane potential (RMP) that is approximately –55 mV. How does this compare to the RMP of most neurons?

Answer 7

The RMP of sinoatrial cells is higher than that of most neurons.

Question 8

An example of a mechanically-gated channel is when a channel opens as a result of

Answer 8

pressure of a fingertip pushing on a doorbell

Question 9

You need sutures to close a cut on your hand, and lidocaine is used to numb the area. Lidocaine works by

Answer 9

blocking the opening of sodium channels

Question 10

The cooler the temperature, the slower the propagation of action potentials. T or F

Answer 10

T

Question 11

Regarding electrical synapses and connexons?

Answer 11

connexons connect the cytosols of the cells involved

Question 12

An IPSP on one area of the membrane at the same time as an EPSP on another area of the membrane would both be considered for the purposes of

Answer 12

spatial summation

Question 13

Which of the following neurotransmitters is only excitatory?

Answer 13

Glutamate

Question 14

Caffeine is an inhibitor of acetylcholinesterase. Therefore, an indirect effect of caffeine would be to

Answer 14

stimulate skeletal muscle contractions

Question 15

Which of the following are unipolar sensory neurons?

Answer 15

meissner and pacinian corpuscles

Question 16

What comprises gray matter?

Answer 16

unmyelinated axons and dendrites

Question 17

In the spinal cord, this surrounds the gray matter.

Answer 17

white matter

Question 18

What gives gray matter its grayish color?

Answer 18

nissl bodies

Question 19

The cerebellum and cerebrum are covered by __________.

Answer 19

a thin layer of gray matter

Question 20

Which of the following is true about glycine’s role as a neurotransmitter?

Answer 20

it causes inhibitory postsynaptic potentials

Question 21

In a given neuron, the current membrane potential is –60 mV. What does this tell you about the current potential compared to the resting membrane potential of –70 mV?

Answer 21

The membrane is depolarized compared to the resting membrane potential.

Question 22

Integration of information from sensory neurons can happen in

Answer 22

the brain

Question 23

In which part of the neuron would the Nissl bodies be found?

Answer 23

soma