Nov15 M3-Regional Circulations Flashcards

1
Q

brain AV diff, O2 cons and flow

A

medium

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2
Q

cerebral flow as fct of BP

A

normal no matter BP but drops below 60 mmH

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3
Q

hyperemia (active hyperemia)def

A

increase in blood flow to an organ due to increased requirements

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4
Q

active hyperemia vs flow autoregul

A

less O2 and increased metabolites act on SM (not bc drop BP but increased demand)

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5
Q

substance that causes dilation of arterioles in brain

A

CO2

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6
Q

situation where CBF increases

A

seizures

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7
Q

response to vessel leak in brain

A

increased venous P, general ANS activation and vasoconstriction to raise BP

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8
Q

name of response to leak in brain

A

CNS ischemic reflex

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9
Q

general name of ischemic reflexes

A

Cushing Response

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10
Q

blood brain barrier (2 improtant things)

A

tight junctions

lot of mts bc lot of active transport

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11
Q

organs with a blood-organ (blood brain like barrier) and one that doesn’t have it

A

brain, spinal cord, CSF

muscle doesn’t have that

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12
Q

lung vs rest body respone to low O2

A

vasoconstriction

rest of body: vaosdilation

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13
Q

kidney AV diff, O2 cons and flow

A

high but low AV diff

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14
Q

kidney 2 moments where substances exchange between blood and kidney

A

glomerular capillaries (go out) and vasa recta (peritubular capillaries) (go back in)

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15
Q

GFR def

A

amount of fluid filtrated in tubules

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16
Q

what organs give blood to portal vein

A

stomach, spleen, panchreas, small intestine, colon

17
Q

liver AV diff, O2 cons and flow

18
Q

origin of flow to liver

A

75% from portal vein

25% from hepatic artery

19
Q

ascites def and cause

A

fluid in abd cavity

portal htn

20
Q

muscle AV diff, O2 cons and flow

A

least flow at rest

21
Q

vascular tone effect on SKM at rest vs exercise

A

rest: SS tone: very constricted
exercise: SS largerly outweighted by waste products (flow increase x30)

22
Q

skin 2 roles

A

protection + thermoregul

23
Q

skin AV diff, O2 cons and flow

24
Q

3 types of heat transfer

A

conduction: skin to air
convection: hot air to cold air
IR radiation

25
reactions to cold
shivering, random chaotic reaction, frostbite
26
frostbite def
blood not directed to extremities
27
what gives skin coloration
deep venous plexus
28
countercurrent exchanger
shunt of heat from arteries to vein when to protect temp when needed
29
temp as fct of O2 consump
linear increase
30
why evaporation important way to lose heat
water needs high T to evaporate. when does so, takes lot of heat
31
flow to skin when exercise
goes up
32
loss of evaporation as fct of temperature
increases linearly