pulmonary blood flow

Question 1

where do extra-alveolar capillaries arise from?

Answer 1

left ventricle

Question 2

what is the purpose of extra-alveolar caps

Answer 2

to deliver oxygen and CO2 to the tissue of the lungs

Question 3

what is venous admixture of extra-alveolar capillaries

Answer 3

blood sent to lung tissue is more oxygen rich than Co2 rich then returns to the left atrium via the pulmonary veins and this mixes blood which causes a little bit more pCO2 than before the blood was sent out.
-does this for convenience and location

Question 4

Alveolar capillary:

Source

Answer 4

right ventricle

Question 5

AC:

PaO2

Answer 5

low

Question 6

AC:

PaCO2

Answer 6

high

Question 7

AC:

Function

Answer 7

Gas exchange

Question 8

AC: return to the heart

Answer 8

Pulmonary vein

Question 9

AC: Blood gases

Answer 9

High PaO2/Low PaCOw

Question 10

Extra-alveolar Capillary:

source

Answer 10

left ventricle

Question 11

EAC:

Pa02

Answer 11

high

Question 12

EAC:

PaCO2

Answer 12

low

Question 13

EAC:

Fucntion

Answer 13

provide nutrients/remove waste from the tissue of the lungs

Question 14

EAC:

Return to the heart

Answer 14

pulmonary vein

Question 15

EAC:

Blood gases

Answer 15

Low Pa02/High PaCO2

Question 16

Pulmonary vascular resistance

Answer 16

PBP = CO X PVR

Question 17

usual pulmonary BP

Answer 17

25/15

Question 18

mean arterial pressure?

Answer 18

diastolic BP + 1/3 pulse pressure

Question 19

pulmonary vascular resistance must be about ___ of the systemic system

Answer 19

1/4

Question 20

what determines the pulmonary vascular resistance?

Answer 20

high number of capillaries, how many are open at a given time, much less sympathetic tone/vasocontricing forces

Question 21

during exercise, PVR (drops or raises)

Answer 21

drops, as more pulmonary capillaries open up to accommodate the increased cardiac output

Question 22

Pulmonary vascular resistance depends on lung volume

Answer 22

at very high lung volumes or low the resistance increases

Question 23

Regional blood flow
Pa, PA, PV
1) zone I
2) zone II
3) zone III

Answer 23

1) PA>Pa>PV
2) Pa>PA>PV
3) Pa>PV>PA