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Applied Phys > Autonomic Nervous system > Flashcards

Autonomic Nervous system Flashcards

1
Q

sympathetic portion releases NE and tends to

A

excite an organ

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2
Q

parasympathetic proton releases _____ tends to ____ the same organ

A

acetylcholin
inhibit

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3
Q

SNS cell bodies of the preganglionic neurons are in the

A

thoracic and lumbar regions of the SC

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4
Q

SNS fibers leave the spinal cord and enter the sympathetic ganglion also known as the

A

paravertebral ganglion

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5
Q

pathways of SNS

A

short pre-ganglionic; long postganglionic

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6
Q
  • SNS pre-ganglionic nt:
  • Post ganglionic receptor:
A
  • ACH
  • nicotinic, Ach receptors
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7
Q
  • SNS post ganglionic neurotransmitter
  • target tissue receptor
A
  • NE
  • Alpha or beta adrenergic receptor
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8
Q

SNS increase

A

hr

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9
Q

PSNS decrease

A

hr

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10
Q

PSNS found in

A

brainstem, sacral spinal cord

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11
Q

PSNS pathways

A

long pre ganglionic; short post ganglionic

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12
Q

PSNS pre ganglionic and post ganglionic neurotransmitter

A

ACh

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13
Q

PSNS post ganglionic receptor

A

Nicotonic Ach receptor

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14
Q

PSNS target tissue receptor

A

muscarinic Ach receptor

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15
Q

Axon ends in

A

varicosities

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16
Q

NT synthesized in the

A

varicosities

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17
Q

Concentration of the ______ influences the strength of the target tissue response

A

neurotransmitters

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18
Q

What stops when NT is no longer present

A

target tissue

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19
Q

how is the NT removed

A
  • diffuses away
  • reuptake of the NT
  • metabolized by enzymes in the ECF
    (NE - monoamine oxidase, ACH- acetylcholinesterase)
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20
Q

the receptors of the SNS are called

A

adrenergic receptors

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21
Q

receptors of the PSNS are called

A

cholinergic receptors

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22
Q

SNS receptors

A
  • nicotinic receptors (Ach)
  • alpha receptors (a1, a2)
  • beta receptors (b1 NE, b2 E)
23
Q

PSNS receptors

A
  • nicotinic receptors (Nn)
  • muscarinic receptors (M1-M5)
24
Q

Epinephrine comes from

A

adrenal medulla

25
Q

NE comings from the

A

post ganglio fiber

26
Q

NE binds strongly

A

a1 and a2

27
Q

E binds strongly to

A

b2

28
Q

PSNS - Ach binds to both

A

nicotinic and muscarinic receptors

29
Q

Sympathetic B1 and B2 effects on the heart

A

increase HR
- increase contractility

30
Q

PSNS M2 effect on the heart

A
  • decrease HR
  • slight decrease in contractility
31
Q

SNS B2 effect on coronary arteries

A

vasodilator

32
Q

SNS a1 and a2 effects on coronary arteries

A

vasoconstrict

33
Q

PSNS M2 on coronary effects

A

vasodilate

34
Q

a1 and a2 on small arteries and arterioles effect

A

vasoconstriction in skin and viscera

35
Q

B2 on small arteries and arterioles

A

vasodilation in skeletal muscles and liver

36
Q

a1 and a2 effects on veins

A

stiffening of the vein

37
Q

A1 and a2 effect on adrenal medulla

A

release of NE and E

38
Q

Regulation of HR by PSNS via and effect

A
  • vagus nerve
  • slows HR by inhibiting SA and AV node
  • decrease contractility of the myocardium indirectly by inhibiting SNS
39
Q

regulation of HR SNS via and effect

A
  • cardiac accelerator nerves
  • increase HR by stimulating SA and AV node
  • increases contractility of the myocardium directly
40
Q

cardiovascular control center is in the

A

medulla oblagonta

41
Q

cardiac acceleration

A

sns

42
Q

cardiac inhibitory center

A

psns

43
Q

vagal stimulation only goes to the

A

heart

44
Q

sympathetic stimulation goes to the

A

heart and blood vessels

45
Q

NTS

A

nucleus tractus solitarius

46
Q

HR is under what control

A

antagonistic control

47
Q

what happens to AP of the SA node that is under SNS activation

A

the resting membrane potential is higher

48
Q

what causes resting membrane potential to be higher?

A

increase of sodium and calcium influx leading to increase rate of the depolirzatino and increase HR

49
Q

vagus nerve –>

A

aortic baroreceptors

50
Q

Glossopharyngeal nerve –>

A

carotid sinus/body

51
Q

SNS response to a decrease in blood pressure - effects on
- sa node
-myocardium
- arteries
- veins

A
  • increase HR
  • HR contractile
  • arteries - vasoconstriction
  • stiffen
52
Q

adrenergic stimulation of blood vessels

A
  • vascular smooth muscle is under tonic control by the SNSN
  • increased firing rate vessel constricts
  • decreased firing rate - vessel dilates
53
Q

a1 adrenergic stimulation causes

A

vasoconstriction

54
Q

b2 adrenergic stimulation vauses

A

vasodilation

Applied Phys (8 decks)

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