pulm circ

Question 1

r ventricle ejection of blood is distributed into lungs and equals

Answer 1

LV cardiac output

Question 2

are extra-alveolar vessels affected by pressures in the lung?

Answer 2

no

Question 3

Capillary resistance reduces with lung volumes that are

Answer 3

low

Question 4

Recruitment and distention of capillaries prevent what with increase in blood flow

Answer 4

rise in pulmonary driving pressure

Question 5

max capillary volume

Answer 5

200ml

Question 6

ave distance rbc travels through capillary

Answer 6

600-800um

Question 7

how many cardiac cycles for pulmonary circulation to accommodate lv diastolic filling pressures

Answer 7

2-3

Question 8

capillary volume approx equal to

Answer 8

stroke volume of right ventricle

Question 9

Increased CO _____ pulmonary vascular pressures, BUT _______ pulmonary vascular resistance

Answer 9

raises, decreases

Question 10

Chief mechanism for fall in PVR

Answer 10

recruitment

Question 11

During inspiration RV receives

Answer 11

greater blood volume in diastole

Question 12

Extra-alveolar vessels ______ during inspiration

Answer 12

dilate

Question 13

Alveolar vessels _______ during inspiration

Answer 13

compress

Question 14

PVR increased with lung volumes that are

Answer 14

higher and lower than FRC

Question 15

mech vent ______ amount of zone 2 lung volume relative to pulmonary venous pressure

Answer 15

increases

Question 16

50% of bronchial blood circulation returns to right atrium via

Answer 16

azygos vein

Question 17

50% of bronchial blood exits lung by small anastomoses with

Answer 17

pulmonary veins to normal venous admixture into left atrium (right to left shunt)

Question 18

zone 2

Answer 18

intermittent flow based on pressure difference with respiration (Pa>PA>Pv)

Question 19

zone 4

Answer 19

reduced blood flow (LV failure, mitral stenosis)pulmonary edema

Question 20

ACTIVE regulation occurs by altering vascular smooth muscle tone in pulmonary vessels

Answer 20

arterioles

Question 21

How do nitroglycerin and sodium nitroprusside work

Answer 21

NO activates guanylyl cyclase and increases cGMP(second messenger)

Question 22

Partial pressure of Oxygen (PAO2) in alveoli crtical factor

Answer 22

in governing pulmonary circulation

Question 23

Capillary resistance with high blood flow rates is

Answer 23

reduced