ch.11

Question 1

surround neuron cell bodies in peripheral nervous system

Answer 1

astrocytes

Question 2

surround neuron axons in CNS

Answer 2

oligodendrocytes

Question 3

contain cilia that move crebral spinal fluid

Answer 3

ependymal cells

Question 4

beome macrophages that destroy microorganisms

Answer 4

microglia

Question 5

surround neuron axons in peripheral nervous system

Answer 5

Schwann cells

Question 6

If a potassium channel opens K+ will flow

Answer 6

out

Question 7

If a sodium channel opens Na+ will flow

Answer 7

in

Question 8

If a chloride channel opens, Cl will flow

Answer 8

in

Question 9

If a calcium channel opens, the membrane will

Answer 9

depolarize

Question 10

If the membrane becomes less positive/more negative than “at rest”

Answer 10

hyperpolarize

Question 11

Which part of a neuron “determines” whether an Action Potential will be sent down the axon?

Answer 11

axon hillock

Question 12

Which of these does NOT impact the speed of an action potential?

Answer 12

neuron location

Question 13

Several EPSPs arrive at a neuron at the same time from different sites. This is:

Answer 13

special summation

Question 14

The resting membrane potential of a neuron is:

Answer 14

-70mv

Question 15

The threshold potential of a neuron is:

Answer 15

-55mv

Question 16

A myelnated region of the nervous system is known as:

Answer 16

white matter

Question 17

Wherever there is a gap/node in a myelinated axon, there is a high concentration of:

Answer 17

sodium channels

Question 18

When a neuron receives input, the effect may decrease as it moves. This is:

Answer 18

graded potential

Question 19

A neuron that carries information to the CNS is a :

Answer 19

sensory neuron

Question 20

Which is the most common type of neurons?

Answer 20

mulitpolar

Question 21

What is the status of channels during the “4” phase of the action potential?

Answer 21

sodium closed/potassium open

Question 22

what is the status of channels during “I” phase of the action potential?

Answer 22

both closed

Question 23

What is the status of channels during the “2” phase of hte action potential?

Answer 23

sodium open/ potassium closed

Question 24

What is the status of channels during the “3” phase of the action potential?

Answer 24

sodium closed/potassium open

Question 25

The absolute refractory period occurs when:

Answer 25

sodium channels cannot open

Question 26

The relative refractory period is:

Answer 26

when sodium channels can open

Question 27

which is true?

Answer 27

none is correct

Question 28

Saltatory conduction is where:

Answer 28

myelin is present

Question 29

Which is the cause of synaptic delay?

Answer 29

release and diffusion of neurotransmitter

Question 30

Which is NOT a biogenic amine?

Answer 30

serotonin