worksheets for exam 4

Question 1

Why is a brain tumor more likely developed from glial cells than from neurons?

Answer 1

neurons dont have centrioles so they dont undergo mitosis

Question 2

Fred was in an accident that damaged some nerves in his arm.

• Which division of the NS was damaged?
• Nerves are bundles of what?
• Which type of neuroglial cells are associated with the above part of neurons?

Answer 2

PNS, axons, schwann cells

Question 3

Gina has a brain infection.

• which division of the NS is infected?
• which type of neuroglial cell will help fight the infection?
• how will the above cell help fight the infection?

Answer 3

CNS, microglia, phagocytes

Question 4

Tetrodetoxin is a toxin that blocks the voltage gated Na+ channels from opening.

• which phase of an electrical signal would be affected by this toxin?
• does the stimulate or inhibit the production of electrical signals?

Answer 4

depolarization, stimulate

Question 5

• In which direction do K+ ions diffuse during the repolarization phase of an electrical signal?
• which condition would interfere with the repolarization phase of an electrical signal- hypokalemia or hyperkalemia?

Answer 5

out of neuron, hyperkalemia

Question 6

Myelin is associated with which part of the neuron?

Answer 6

axon

Question 7

What is a synapse?

• neurotransmitters are released from which part of the presynaptic neuron?
• which part of a postsynaptic neuron has receptors for neurotransmitters?

Answer 7

site of communication between neurons, axon terminals, dendrites and cell body

Question 8

What determines the effect neurotransmitters will have on postsynaptic cells?

Answer 8

which channel is open

Question 9

Are a person’s pupils dilated or constricted at night?

Answer 9

dilated to absorb as much light as possible

Question 10

When Taylor begins to feel drowsy while driving she opens her window, turns up the volume of the car stereo, and sips her ice cold water.

• these actions help keep her awake by stimulating the:
• the above structures are located throughout which part of the brainstem?

Answer 10

RAS, midbrain

Question 11

what does the medulla oblongata regulate?

Answer 11

heart rate, blood pressure, and breathing rate

Question 12

which structure of the CNS helps maintain balance?

Answer 12

cerebellum

Question 13

function of broca’ area?

Answer 13

aids in smooth speech

Question 14

function of the wernicke’s area

Answer 14

makes sure what we say makes sense