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MED 310 > extra > Flashcards

extra Flashcards

1
Q

what shows gating

A

ion channesl

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2
Q

distribution of ion channels

A

not evenly distributed

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3
Q

what do action potentials rely on

A

voltage gated channels

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4
Q

what are the two gates in Na channles

A

activation gate
inactivation gate

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5
Q

what channels are opened at rest

A

Na and K are closed at rest

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6
Q

what leads to Na channel opening

A

depolarization

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7
Q

what is the threshold voltage

A

-50

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8
Q

what underlies the all or none action potentials

A

Na channesl

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9
Q

explosive depolarization voltage

A

0

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10
Q

what happnes at the peak of the action potential

A

Na activation gate begins to close
K channel opens

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11
Q

what happnes during AHP

A

harder to elicit AP bc membrane is more hyperpolarized

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12
Q

what does membrane repolarization lead to

A

Na and K channels to return to closed state and are availabel for the next stimulation

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13
Q

what is myelin NOT

A

it doesnt conduct current
NOT part of axon!!!!!

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14
Q

Aa nerve fibres

A

propriocption and contraction of skeletal muscles

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15
Q

Ab nerve fibres

A

touch

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16
Q

Ag nerve fibres

A

acute pain

17
Q

C nerve fibres

A

chornic or dull pain
itch
temp

18
Q

what shape are SM cells

A

spindle

19
Q

axon like fibre transmitting AP in muscle

A

t tubule

20
Q

muscle fibre to motor neuron ending

A

one endplate per cell

21
Q

a2 muscle fibre

A

slow twitch

22
Q

a2 threshold

A

low threshold

23
Q

a1 threshold

A

high threshild

24
Q

where do motor neurons originate from

A

spinal chord

25
Q

a2 contractile forces

A

greater than a1

26
Q

what is moved aside by ca2+

A

tropomyosin

27
Q

type of muscle in blood vessels

A

smooth muscle

28
Q

what are the two division of the efferent division

A

somatic and autonomic

29
Q

what does the CNS consist of

A

brain and spinal chord

30
Q

what are the effectors and sensro

A

neurons

31
Q

what cells play a role in proteciton and support

A

glial cells

32
Q

the first two ventricels

A

two lateral ventricles, one in each side o fht ebrain

33
Q

where is the choroid plexus

A

in each ventricle, forms CSF

34
Q

what does the CSF not contain

A

no blood cells and little protein

35
Q

hydrocephalus

A

problems with CSF formation or reabsorption

MED 310 (47 decks)

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