ANS Flashcards

1
Q

ANS is centrally regulated by nuclei in: (4)

A

Medulla
Pons
Hypothalamus
Spinal cord

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2
Q

Afferents tracts affecting CNS classified as: (4)

A
  1. Visceral afferents
  2. Somatic afferents
  3. Central chemo afferents
  4. Cognitive components
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3
Q

Divisions of ANS

A

Sympathetic NS

Parasympathetic NS

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4
Q

SNS is designed for _____, some examples include _____

A

Coping with acute challenges

Ex: HR, BP

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5
Q

PSNS regulates (2)

A

Metabolism
Cardiovascular function

** More localized in action**

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6
Q

Preganglionic neurons are ________ fibers that primarily use _____ (a neurotransmitter)

A

Cholinergic

ACh

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7
Q

Post-ganglionic fibers have receptors that can bind

A

ACh or nicotine

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8
Q

What are cholinergic-nicotine, N2 receptors?

A

Post-ganglionic cholinergic receptors that bind nicotine

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9
Q

Post-ganglionic fibers are _____ and primarily use ____ (a neurotransmitter)

A

Noradrenergic

Norepi

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10
Q

When post-ganglionic receptors are activated, it allows _____ because the receptors are ______

A

Inward current of Na and Ca

Modified ion channels

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11
Q

Adrenoceptors are coupled to

A

G protein activation

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12
Q

Isoforms of adrenoceptors determines

A

Specificity of the response to adrenergic stimulation

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13
Q

α1 Adrenoceptors

A

Vasoconstriction in VSM

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14
Q

β2 Adrenoceptors

A

Found in heart and smooth muscle beds

Vasodilation

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15
Q

β1 Adrenoceptors

A

Increase chronotropy (HR) and inotropy (contractile force) in Heart

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16
Q

Preganglionic SNS fibers termineate in ______ and synapse with ________

A

Adrenal medulla

Chromatin cells

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17
Q

Chromatin cells synthesize _____ and are stimulated by _______ to release it into circulation

A

Epi and Norepi

ACh

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18
Q

Epi has a high affinity for _______ adrenceptors

A

α and β

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19
Q

At low doses of epi, it binds to

A

β2 adrenoceptors to induce vasodilation

20
Q

At all doses of epi, it’s a strong

A

β1 agonist

21
Q

Norepi is a strong

A

β1 and α1 agonist

22
Q

Lower doses of norepi, you have a

A

Pressed effect- mediated vasoconstriction from α1

23
Q

Beta blockers

A

β1 adrenoceptor antagonists

End in -olol

24
Q

Examples of beta blockers

A

Atenolol and Metoprolol

High specificity against β1

25
SNS activated during
Cognitive and/or physical stress
26
Sympathomimetics are compounds that
Stimulate adrenceptor activity (agonists)
27
Alpha blockers suppress _____ so they're helpful for _____
Vascular smooth muscle tone | Reducing hypertension
28
Propranolol
Beta blocker | Non-specific
29
Beta blockers are used to
Control angina and hypertension
30
Preganglionic PSNS fibers originate in the _______ of the ______
Brainstem and sacral region | Spinal cord
31
Most preganglionic PSNS fibers are in the
Vagus nerve
32
Effectors of PSNS have ____ receptors that can bind _____ and are ______ receptors
Cholinergic-muscarinic (CM) Muscarine G protein coupled
33
ACh binds to _____ receptors on the _______ membrane
Cholinergic (muscarinic or nicotinic) | Post-synaptic
34
How to prevent prolonged activation of cholinergic receptors on post-junctional membrane?
ACh is degraded by a cholinesterase
35
Elevated SNS tone leads to
Increased HR
36
PSNS activity leads to
Decreased HR
37
Where is PSNS innervate on primarily located?
SA and AV nodal tissues
38
Av node is the juncture between the ______ and ______
Right and left atria | Ventricles
39
Effector: contract bronchial smooth muscle What's the SNS effect and receptor? What's the PSNS effect and receptor?
Inhibitory, β2 | Stimulatory CM
40
Effector: contraction, cardiac muscle What's the SNS effect and receptor? What's the PSNS effect and receptor?
Stimulatory, β1 | N/a
41
Effector: heart rate, SA node What's the SNS effect and receptor? What's the PSNS effect and receptor?
Stimulatory, β1 | Inhibitory, CM2
42
Effector: renin secretion, kidney What's the SNS effect and receptor? What's the PSNS effect and receptor?
Stimulatory, β1 | N/a
43
Effector: glycogenolysis, gluconeogenesis (liver) What's the SNS effect and receptor? What's the PSNS effect and receptor?
Stimulatory, β2 | N/a
44
Effector: adipocytes, lipolysis What's the SNS effect and receptor? What's the PSNS effect and receptor?
Stimulatory, β3 | N/a
45
Effector: contraction, skeletal muscle force What's the SNS effect and receptor? What's the PSNS effect and receptor?
Stimulatory, β1 | N/a
46
Effector: contraction, VSM What's the SNS effect and receptor? What's the PSNS effect and receptor?
Stimulatory, A1; Inhibitory, β2 (skeletal muscle) | Generally non, microcirculation, inhibition mediated by VIP
47
Effector: pancreas (β cells), insulin secretion What's the SNS effect and receptor? What's the PSNS effect and receptor?
Initiatory, β2 | Stimulatory, CM