nervous system 11.1

Question 1

2 components of CNS

Answer 1

brain + spinal cord

Question 2

2 pathways in PNS

Answer 2

sensory pathways and motor pathways

Question 3

2 components in motor pathway

Answer 3

somatic (voluntary) and autonomic (involuntary)

Question 4

2 components of autonomic pathway

Answer 4

sympathetic (fight/flight) ad parasympathetic (rest and digest)

Question 5

pathway of impulse

Answer 5

sensory receptor- sensory neuron- interneuon- motor neuron- muscle/effector

Question 6

dendrites

Answer 6

receive info form axons and carry impulses to cell body

Question 7

cell body

Answer 7

recieves input from dendrites and relays it to axons

Question 8

axons

Answer 8

carry impulses away from cell body

Question 9

axons terminals

Answer 9

release NT to receptors of dendrites of other neurons

Question 10

myelin sheath

Answer 10

insulator preventing the loss of ions and speeding up nerve impulses

Question 11

nodes of ranvier

Answer 11

unmyelinated gaps in myelin sheath
impulses jump from one node to the next

Question 12

white matter

Answer 12

myelinated axons

Question 13

grey matter

Answer 13

unmyelinated axons

Question 14

reflex arc

Answer 14

involuntary response to stimuli that happens before the brains aware of what’s happening

Question 15

describe synaptic tranismission

Answer 15

generally- Ca flood in, NT go to edge of presynaptic membrane and through exocytosis enter the synaptic cleft. NT diffues through cleft and onto the post synaptic protein receptors changing the membranes permiabilty to Na

Question 16

Na/K exchange pump uses ___

Answer 16

ATP to transport 3 Na ot of cell and 2k in

Question 17

AP occurs at ___

Answer 17

nodes of ranvier in myelinated neurons

Question 18

-70__ -50 has ____ effect

Answer 18

no effect on depolarization

Question 19

NT can be ___ or ____

Answer 19

excitatory or inhibitory

Question 20

gap between neuron-=

Answer 20

synaptic cleft

Question 21

threshold =

Answer 21

-55mv depolarizing to 35mv

Question 22

resting membrane potention =

Answer 22

70 MV

Question 23

nerve impulse travels

Answer 23

dendrites-cell body-axons- axon terminals

Question 24

4 parts of a nerve impulse

Answer 24

1)resting membrane potential
2) depolarization
3)repolarization
4)refractory period