Nov15 M3-Regional Circulations

Question 1

brain AV diff, O2 cons and flow

Answer 1

medium

Question 2

cerebral flow as fct of BP

Answer 2

normal no matter BP but drops below 60 mmH

Question 3

hyperemia (active hyperemia)def

Answer 3

increase in blood flow to an organ due to increased requirements

Question 4

active hyperemia vs flow autoregul

Answer 4

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

Question 5

substance that causes dilation of arterioles in brain

Answer 5

CO2

Question 6

situation where CBF increases

Answer 6

seizures

Question 7

response to vessel leak in brain

Answer 7

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

Question 8

name of response to leak in brain

Answer 8

CNS ischemic reflex

Question 9

general name of ischemic reflexes

Answer 9

Cushing Response

Question 10

blood brain barrier (2 improtant things)

Answer 10

tight junctions

lot of mts bc lot of active transport

Question 11

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

Answer 11

brain, spinal cord, CSF

muscle doesn’t have that

Question 12

lung vs rest body respone to low O2

Answer 12

vasoconstriction

rest of body: vaosdilation

Question 13

kidney AV diff, O2 cons and flow

Answer 13

high but low AV diff

Question 14

kidney 2 moments where substances exchange between blood and kidney

Answer 14

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

Question 15

GFR def

Answer 15

amount of fluid filtrated in tubules

Question 16

what organs give blood to portal vein

Answer 16

stomach, spleen, panchreas, small intestine, colon

Question 17

liver AV diff, O2 cons and flow

Answer 17

high flow

Question 18

origin of flow to liver

Answer 18

75% from portal vein

25% from hepatic artery

Question 19

ascites def and cause

Answer 19

fluid in abd cavity

portal htn

Question 20

muscle AV diff, O2 cons and flow

Answer 20

least flow at rest

Question 21

vascular tone effect on SKM at rest vs exercise

Answer 21

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

Question 22

skin 2 roles

Answer 22

protection + thermoregul

Question 23

skin AV diff, O2 cons and flow

Answer 23

lowest

Question 24

3 types of heat transfer

Answer 24

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

Question 25

reactions to cold

Answer 25

shivering, random chaotic reaction, frostbite

Question 26

frostbite def

Answer 26

blood not directed to extremities

Question 27

what gives skin coloration

Answer 27

deep venous plexus

Question 28

countercurrent exchanger

Answer 28

shunt of heat from arteries to vein when to protect temp when needed

Question 29

temp as fct of O2 consump

Answer 29

linear increase

Question 30

why evaporation important way to lose heat

Answer 30

water needs high T to evaporate. when does so, takes lot of heat

Question 31

flow to skin when exercise

Answer 31

goes up

Question 32

loss of evaporation as fct of temperature

Answer 32

increases linearly