biophysiscs

Question 1

rate of blood flow to each tissue is controlled by….

Answer 1

tissue need. specifically by arterioles, Central nervous control, hormone control

Question 2

CO is controlled by…

Answer 2

mainly sum of local tissue flows. specifically venous return, automatic response, central nervous control

Question 3

arterial pressure reg. is generally independent of ..

Answer 3

local BF control or CO control

Question 4

arterial pressure is controlled by

Answer 4

sensor feedback, kidneys

Question 5

if BP falls feedback systems will

Answer 5

increase contractility, constrict large veins (transfer blood to arteries), stimulate constriction of arterioles (hold in artery), stimulate renal controlled change in BV

Question 6

shear stress equation

Answer 6

(4nQ)/(pi r^3)

Question 7

reynolds number equation

Answer 7

(vdp)/n velocity=cm/sec diameter=cm p=g/cm^3

Question 8

turbulence occurs at side branches

Answer 8

at 200-400

Question 9

straight line turbulence occurs at

Answer 9

2000

Question 10

poiseuilles law

Answer 10

(pi delta p r^4)/(8nl)

Question 11

blood viscosity vs water

Answer 11

3 times as viscous

Question 12

trans cap pressures arterial

Answer 12

plasma colloid 28, cap pressure 30 (10 in veins), neg interstitial- 3, interstitial colloid 8 net= 13 out veins= 7i n

Question 13

pulmonary trans cap pressures

Answer 13

plasma colloid 28, cap pressure 7, neg interstitial- 8, interstitial colloid 14 net out=1

Question 14

lymphatic flow returned to circulatory system daily

Answer 14

2.5 liters

Question 15

peripheral veins

Answer 15

veins out of thorax

Question 16

central veins

Answer 16

veins in thorax. lowest pressure in vascular system. determine ventricular fillings if no lung problems

Question 17

aorta: diameter, wall thickness, number, total CSA

Answer 17

2.5cm, 2mm , 1, 4.5 cm^2

Question 18

arteries: diameter, wall thickness, number, total CSA

Answer 18

.4 cm, 1 mm, 160 , 20 cm^2

Question 19

arterioles: diameter, wall thickness, number, total CSA

Answer 19

30 um ,20 um ,5 x 10^7, 400 cm^2

Question 20

capillaries: diameter, wall thickness, number, total CSA

Answer 20

5 um, 1um, 10^10, 4500 cm^2

Question 21

venules : diameter, wall thickness, number, total CSA

Answer 21

70 um, 7um, 10^8, 4000 cm ^2

Question 22

veins: diameter, wall thickness, number, total CSA

Answer 22

.5cm, 5mm , 200, 40cm^2

Question 23

vena cavae: diameter, wall thickness, number, total CSA

Answer 23

3cm, 1.5mm, 2, 18cm^2

Question 24

BV distribution

Answer 24

pulm. circ. 9% heart 7% systemic circ. 84%. arteries 13%, arterioles and caps. 7%, veins venules and sinuses 64%

Question 25

flow velocity arteries vs caps

Answer 25

500 mm/s vs .5mm/s

Question 26

mean blood pressure in caps

Answer 26

20-25 mmHg

Question 27

mean blood pressure in arteries

Answer 27

100 mmHg

Question 28

arterial cap pressure

Answer 28

30

Question 29

pulmonary cap

Answer 29

7 mmhG

Question 30

central veins

Answer 30

0 mmHg

Question 31

MAP formula

Answer 31

((PS-PD)/3) +PD or CO x TPR if CVP is 0