blood supply,meninges,nerve anatomy&function

Question 1

function of the meninges:

Answer 1

supplies blood to the brain

protects the CNS

Question 2

what does a neuroglial cell do?

Answer 2

helps supports other cells in the nervous system

Question 3

describe resting potential

Answer 3

when its depolarized in the cell, sodium is rushing in, potassium is outside

Question 4

define salutatory conduction:

Answer 4

increases the speed of the impulse by the nodes of ranvier

Question 5

what does the excitatory potential do?

Answer 5

starts action potential

Question 6

what does the inhibitory potential do?

Answer 6

stops or prevents action potential from happening

Question 7

what is a nerve impulse?

Answer 7

a signal transmitted along a nerve fiber

Question 8

what does the ACA (anterior cerebral artery) supply?

Answer 8

medial, anterior and superior portions of the cerebral hemisphere

Question 9

what does the MCA supply?

Answer 9

lateral surface of cerebral artery

Question 10

what does the PCA supply?

Answer 10

posterior portion and inferior aspect of the medial surface of the cerebral hemisphere

Question 11

what arteries make up the circle of willis?

Answer 11

basilar and internal carotid

Question 12

function of circle of willis?

Answer 12

provide multiple paths for oxygenated blood to the brain if other suppliers cant
gives lots of blood supply to the brain

Question 13

main steps of action potential:

Answer 13

threshold
depolarization
repolarization
refractory period
resting state

Question 14

function of ANS

Answer 14

maintain homeostasis

control involuntary movement

Question 15

PNS=

Answer 15

cranial nerves
sensory nerves
motor nerves

Question 16

dermatome =

Answer 16

area of skin innervated from a single spinal nerve root

Question 17

myotome

Answer 17

relationship between the spinal nerve and muscle