Nervous System

Question 1

What does the CNS include?

Answer 1

Brain and Spinal Cord

Question 2

What does the PNS include?

Answer 2

Cranial and Spinal Nerves (Motor and Sensory)

Question 3

What is the negative resting potential for a neuron?

Answer 3

-70mv

Question 4

At what charge level do neurons become excitable?

Answer 4

-50mv

Question 5

What kind of ions rush in to depolarise the cell?

Answer 5

Positive sodium ions

Question 6

What is action potential?

Answer 6

When cells become depolarised and become more positive inside than outside

Question 7

How does a cell restore itself after action potential?

Answer 7

Positive potassium ions flow out of channels and restores negative charge outside

Question 8

What is the myelin sheath?

Answer 8

Schwann cells that block ion movement so action potential has to jump from nodes of ranvier

Question 9

What are the 2 types of synapses?

Answer 9

electrical and chemical

Question 10

For chemical transmission, what type of voltage gated channels are required?

Answer 10

Calcium channels

Question 11

What neurotransmitter is released into synaptic cleft in chemical transmission?

Answer 11

Acetycholine

Question 12

Are all neurotransmitters taken by postsynaptic terminal?

Answer 12

No, some diffuse, reuptaken or degrade

Question 13

What are dendrites?

Answer 13

Short threadlike and conduct impulse towards cell body and to other dendrites when action potential occurs