Nervous System

Question 1

Cell Potential (Good graph)

Answer 1

Question 2

Action Potential Threshold

Answer 2

If reached, neuron will fire

Question 3

myelin sheath

Answer 3

acts as an insulator for neural activity. Is much faster and allows less “leakage”

Question 4

unmyelinated neurons

Answer 4

less efficient. Have channels distributed amongst the whole axon.

Question 5

axons

Answer 5

transmit chemical and electrical impulses away from cells

Question 6

resting potential and threshold?

Answer 6

resting -70

threshold -55

Question 7

refractory period

Answer 7

when there is too much K in the cell after reaching peak, and cell is re-regulating itself

Question 8

GABA (inhibitor or promoter)

Answer 8

inhibitory neurotransmitter

Question 9

acetylcholine

Answer 9

skeletal muscle function (somatic system)

(triggers muslce contraction)

(inhibiting this would cause muscle paralysis)

Question 10

excitatory synapse

Answer 10

allows an influx of positive ions into adjacent neurons

Question 11

inhibitory synapse

Answer 11

allows either positive ions to leave or negative ions to go inside of an adjacent neuron

Question 12

somatic nervous system

Answer 12

skeletal muscles

Question 13

autonomic nervous system

Answer 13

contains para and sympathetic nervous system

(controls glandular muscles, smooth muscles, and NON SKELETAL muscles)

(makes sense, start to sweat, etc)

Question 14

Good picture of para and sympathetic nervous sytems

Answer 14

Question 15

How does alzheimers affect the brain

Answer 15

causes brain plaques, makes firing neurons difficult and leads to neuron death

Question 16

multiple sclerosis. What does it do?

Answer 16

attacks myelin sheaths

Question 17

huntingtons disease

Answer 17

affects basal ganglia

Question 18

gray matter vs white matter

Answer 18

gray matter is in the brain, allows short distance communication (cell bodies)

White matter allows long distance communication (axons)

Question 19

oligodendrocytes

vs schwann cells

Answer 19

myelinates multiple axons

Schwann one myelinates one (schwann) cell

Question 20

microglia

Answer 20

phagocytosis waste for neurons

Question 21

astrocytes

Answer 21

from blood brain barrier

Question 22

correct order of neuron communication

Answer 22

axon, synapse, dendrite, soma

Axons send the info to the synapse. The dendrites of the post synaptic cell receive the signal and transfer it to the soma (cell).