Function of arteries and veins

Question 1

distensibility formula

Answer 1

(change in volume)/(change in pressure x original vol.)

Question 2

veins are… times more distensible than arteries

Answer 2

8. same increase in pressure would result in 8 times volume in veins

Question 3

pulmonary arteries are …. times more distensible than systemic arteries

Answer 3

6

Question 4

compliance formula

Answer 4

compliance = change in volume/ change in pressure or distensibilty x initial volume

Question 5

compliance of systemic veins vs systemic artery

Answer 5

24 times (8 times distensible and 3 times the volume)

Question 6

700 mls gives how much pressure in arteries

Answer 6

100 mmHg if vol. falls to 400 mls pressure falls to 0 2ml/mmHg

Question 7

venous volume ranges

Answer 7

2000-3500 mls 100 ml/mmHg

Question 8

venous compartment can maintain normal circulatory function with BV loss of

Answer 8

25%

Question 9

pressure pulse velocity of transmission

Answer 9

3-5 m/ sec in aorta, 7-10 m/sec in large arteries, 15-35 m sec in small arteries. aortic pressure wave velocity is 15 times faster than actual blood transmission

Question 10

pulse pressure =

Answer 10

Ps-Pd or SV/Ca

Question 11

Ps=

Answer 11

SVxHRxSVR+ 2/3 (SV/Ca)

Question 12

Pd=

Answer 12

SVxHRxSVR+ 1/3 (SV/Ca)

Question 13

damping effect on pulse pressure

Answer 13

resistance to blood movement and changes in vessel compliance

Question 14

RAP

Answer 14

0 max =20-30 min=-3 to -5.

Question 15

RAP contributors

Answer 15

decreased by: increased contractility,decreased venous return (i.e. decreased BV, decreased venous tone, constriction of arterioles).
increased by: decreased contractility, increased venous return (increased BV, increased venous tone, dilation of arterioles)

Question 16

peripheral venous pressure usually … higher than RAP

Answer 16

4-6. RA must rise this much before before you see rise in peripheral venous pressure

Question 17

intrabdominal pressure in pregnancy tumors obesity

Answer 17

15-30

Question 18

pressure in feet standing still

Answer 18

90. normally 20. can lose 10 -20% of cbv in 15- 30 minutes if standing still

Question 19

spleen BV

Answer 19

100 MLS

Question 20

LIVER BV

Answer 20

SEVERAL HUNDRED MLS

Question 21

large abdominal veins BV

Answer 21

approx 300 mls.

Question 22

venous plexus beneath skin BV

Answer 22

several hundred mls

Question 23

heart BV

Answer 23

50-100 mls

Question 24

lungs BV

Answer 24

100-200 mls