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

19
Q

axon like fibre transmitting AP in muscle

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
a2 contractile forces
greater than a1
26
what is moved aside by ca2+
tropomyosin
27
type of muscle in blood vessels
smooth muscle
28
what are the two division of the efferent division
somatic and autonomic
29
what does the CNS consist of
brain and spinal chord
30
what are the effectors and sensro
neurons
31
what cells play a role in proteciton and support
glial cells
32
the first two ventricels
two lateral ventricles, one in each side o fht ebrain
33
where is the choroid plexus
in each ventricle, forms CSF
34
what does the CSF not contain
no blood cells and little protein
35
hydrocephalus
problems with CSF formation or reabsorption