1.2 Neurons

Question 1

What are neurons?

Answer 1

nerve cells that conduct electrical impulses and relay information through the body

Question 2

What are the three basic parts of a neuron?

Answer 2

dendrite
cell body
axon

Question 3

Do neurons undergo mitosis?

Answer 3

NO

Question 4

How long can neurons survive without oxygen?

Answer 4

only minutes

Question 5

What is the function of the neuronal cell body?

Answer 5

synthesizes all nerves cell products

Question 6

What is a distinguishing feature of a neuronal cell body?

Answer 6

large nucleus

Question 7

What is the function of dendrites?

Answer 7

receiving end of a neuron that conduct a nerve impulse toward the cell body

Question 8

What is a distinguishing feature of a dendrite?

Answer 8

numerous short extensions that emanate from the body

Question 9

What is the function of the axon?

Answer 9

conducts nerve impulses away from the cell body to the axon terminals

Question 10

What do axons lack?

Answer 10

rough ER

Question 11

What is lacking in the neuronal cell body?

Answer 11

centrioles since they do not undergo mitosis

Question 12

What are neurotransmitters?

Answer 12

chemicals that carry the transmission of the nerve impulse from one neuron to another

Question 13

Where are neurotransmitters stored?

Answer 13

secretory vesicles at the end of axon terminals

Question 14

What is a synapse?

Answer 14

gap between two neurons

Question 15

What does presynaptic neuron mean?

Answer 15

neuron before the synapse

Question 16

What does postsynaptic neuron mean?

Answer 16

neuron after the synapse

Question 17

How are neurons classified structurally?

Answer 17

by the number of extensions from their cell body

Question 18

What are multipolar neurons?

Answer 18

neurons that have three or more extensions from the cell body

Question 19

What are the main multipolar neurons?

Answer 19

motor neurons

Question 20

What are bipolar neurons?

Answer 20

neurons with a central body and two extensions