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Physio 2 > Blood pressure regulation > Flashcards

Blood pressure regulation Flashcards

1
Q

Difference of pressure and mean pressure of artery

A

mean = Diastolic P + 1/3 pulse P

Pulse P is systolic - diastolic

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2
Q

Why pulse P can travel faster than blood w/in artery

A

They are independent occurences

Pulse P is a shock wave

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3
Q

Why does shape of PP change down arterial tree

A

it changes as velocity changes

Less compliant arteries leads to faster PP

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4
Q

Elasticity and velocity

A

Reciprocal relationship

As E increases PP decreases

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5
Q

Vasoconstriction effects

A

Arterial diastolic bp increases

Capillary Hydrostatic pressure decreases

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6
Q

Vasodilation effects

A

Arterial diastolic P decreases, CHP increases due to increased B volume

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7
Q

Vasoconstriction on tone

A

Stimulation on alpha 1 R
Resistance increased
Reduced blood perfusion
Capillary P decreases

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8
Q

Vasodilation on tone

A

Reduction of alpha 1 R
Increase in B flow to arteriolar diameter
Diastolic P decreases
Capillary P increases

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9
Q

PARASYMPATHETIC

A

NO EFFECT OF VESSEL DIAMETER

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10
Q

Vasoconstrictor center

P center

A

Groups of cells that when stimulated result in vasoconstriction

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11
Q

Vasodilator center

depressor center

A

Group of cells when stimulated result in vasodilation of areterioles

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12
Q

Cardioexcitatory center

A

When stimulated causes an increase in sympathetic activity
Increased HR, contractility and conduction velocity of AP
Beta 1 R

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13
Q

Cardioinhibitory center

A

Increase vagus tone results in decreased heart rate

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14
Q

Baroreceptors decreased stimulation

A

Activate Vasoconstrictor centers

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15
Q

Baroreceptors increased stimulation

A

activation of vasodilator center increases vagal tone

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16
Q

PCO2

A

Increased CO2 exerts local effect on brain causes relaxation of vascular smooth muscle. Vasodilation
Stimulates vasoconstrictor center attempt to raise BP

17
Q

2 Fx of cholinergic sympathetic fiber

A

Produces vasodilation in anticipation of activity/exercise

Activates sweat glands in anticipation of activity

18
Q

Effect of acute decrease BP on firing response from carotid sinus baroreceptor

A

< in BP means a < in the stretch of baroR
Freq of baroR firing will <
effect is to < in inhibition of the vasoconstrictor center

19
Q

Effect of acute increase BP on firing response from CS baroR

A

> BP > the stretch on BaroR
cause > firing of baroR
effect is to increase in the inhibition of vasoconstrictor center

20
Q

Consequence of adaptation of baroR to hypertension

A

It resets to new pressure, drugs lower BP the baroR think it is hypotensive activate sympathetic tone
Heart palpitations
Renin angiotensin

21
Q

Describe carotid sinus reflex

A

Reclining to standing
< in P in carotid sinus
< in P + flow to brain
< in fining of baroR

22
Q

Systemic capillary filtration & readsorption

A

< filtration

> readsorbtion

23
Q

Atrial P on ADH release

A

< in atrial P results in > ADH release -> decrease in water & Na loss

24
Q

Atrial P stretch on atriopeptin ANF release

A

Atrial P < will result in < of ANF -> < in water and Na loss

25
Q

GFR glomerular filtration rate

A

< BP results in < of GF -> water retention

26
Q

Sympathetic tone & renin angiotensin aldosterone system

A

< BP > sympathetic tone activates vasoconstrictor center and renin to ang II

27
Q

Angiotensin II

A

> aldosterone production -> > water reabsorption
vasoconstrictor
ang II activates thirst centers in brain

28
Q

Compensation of BP

A

all compensate for low BP by increasing blood volume

29
Q

Vasodilation

A

alpha 1 R decreased sympathetic tone

30
Q

Vasoconstriction

A

alpha 1 R increased sympathetic tone

31
Q

Muscarinic R

A
  • HR
32
Q

Beta adrenergic

A

+ HR and contractility

Physio 2 (9 decks)

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