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SEM 1 + 2 CVS > CVS reflexes > Flashcards

CVS reflexes Flashcards

1
Q

where are the arterial baroreceptors found

A

carotid sinus

aortic arch

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2
Q

what does loading mean

A

effect of increase in BP on baroreflexe.g. stress

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3
Q

4 effects of the depressor response

A

BP falls
bradycardia
vasodilatation
pulse pressure falls

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4
Q

what is unloading

A

effect of decreased BP on the baroreflex e.g. in hamorrhage

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5
Q

4 effects of the pressor reflex

A

adrenaline secretion
vasopressin secretion
stimulation of RAAS
vasoconstriction

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6
Q

3 types of cardiac receptors

A

nociceptive sympathetic afferents
veno-atrial mechanoreceptors
ventricular mechanoreceptors

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7
Q

what is the nociceptive sympa afferents stimulated by

A

K+/H+ produced during ischaemia

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8
Q

what does the nociecptice sympa afferents cause

A

angina

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9
Q

what is the venoatrial mechanoreceptors stimulated by

A

overdistension of atria

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10
Q

what are the two parts to the veno-atrial mechanoreceptor reflex

A

initial pressor reflex(inc HR)

long term depressor reflex(inc diuresis)

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11
Q

what are ventricular mechanoreceptors stimulated by

A

over distension of ventricles

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12
Q

what does the ventricular mechanoreceptors cause

A

sends cardiac vagal afferents to NTS which initiates a depressor response
override hearts response

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13
Q

where are muscle metaboreceptors found

A

skeletal muscle

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14
Q

what metabolites are released during exercise

A

ATP
K+
lactate
adenosine

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15
Q

what are muscle metaboreceptors activated by

A

metabolites released during exercise

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16
Q

what does the activated metaboreceptors initiate

A

pressor reflex

17
Q

what does local anaesthetic do

A

blocks metaboreceptors afferent fibres

prevents pressor receptors

18
Q

what does NTS send impulses to

A

CVLM

19
Q

what does CVLM do

A

inhibit RVLM

20
Q

what does RVLM do

A

inc sympa

21
Q

what do baroreceptors do when they sense a rise in BP

A

increase impulses to NTS

22
Q

what doe baroreceptors do when they sense a decrease in BP

A

decrease impulses sent to NTS

23
Q

what happens when baroreceptors innervated by parasympathetics sense a rise in BP

A

afferents to NTS
NTS stimulates nucleus ambiguus
vagal to SAN
bradycardia

24
Q

what is fainting also called

A

vaso-vagal attack

25
Q

what is fainting initiated by

A

emotion stimulating parasympathetics to the heart

SEM 1 + 2 CVS (14 decks)

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