week 2

Question 1

depolarization

Answer 1

Na+ channel opens

Question 2

repolarization

Answer 2

Na+ channels are inactiving, and K+ channels open.
* Membrane returns to resting membrane

Question 3

propagation

Answer 3

allows AP to be transmitted from origin down entire axon length toward terminals

Question 4

refractory period

Answer 4

time in which neuron cannot trigger another action potential

Question 5

conducting velocity

Answer 5

ap occurs only in axons, not other cell areas
speed varies

Question 6

rate of ap propagation depends on

Answer 6

1. axon diameter
   
   • larger diameter fibers have less resistance to local
     current flow, so have a faster impulse conduction.

Question 7

multiple sclerosis

Answer 7

an autoimmune disease that affects primarily young adults
- myelin sheaths in CNS are destroyed when immune
system attacks myelin
- turns myelin into hardened lesions called scleroses

Question 8

the synapse

Answer 8

the nervous system works because information flows from neuron to neuron

Question 9

the synapse

Answer 9

the nervous system works because information flows from neuron to neuron

Question 10

neurotransmitters

Answer 10

language of nervous system

Question 11

acetylcholine

Answer 11

released at neuromuscular junctions.

Question 12

biogenic amines

Answer 12

catecholamines
indolamines
- all widely used in brain

Question 13

amino acids

Answer 13

make up all the proteins
glutamate, aspartate, glycine, GABA

Question 14

peptides

Answer 14

substance P: mediator of pain signals
endorphins: beta endorphin, dynorphin, and enkephalins
gut-brain peptides: somatostatin and cholecystokinin play a
role in regulating digestion.