Blood Flow through the Vessels

Question 1

radius is the most important factor for determining

Answer 1

the rate of blood flow

Question 2

resistance is

Answer 2

inversely related to radius to the power of 4

Question 3

removal of an organ

Answer 3

increases peripheral vascular resistance

Question 4

amputation/organ donor

Answer 4

decreased conductance, increased resistance

Question 5

if tumors >50um develop collateral system

Answer 5

increased conductance, decreased resistance

Question 6

for parallel blood flow the SVR is..

Answer 6

sum of the reciprocal of the resistance of all arteries, arterioles, capillaries, venules, veins

Question 7

sympathetic stimulation causes

Answer 7

constriction, greater pressure required for given flow

Question 8

sympathetic inhibition causes

Answer 8

dilation, greater flow for given pressure

Question 9

the pressure flow relation of vessels depends on

Answer 9

their amount of muscular and elastic tissue

Question 10

muscular tissue confers

Answer 10

contractility

Question 11

elastic tissue confers

Answer 11

distensibility

Question 12

veins are …

Answer 12

highly distensible

Question 13

large arteries are…

Answer 13

distensible by a reflex myogenic contraction occurs

Question 14

arterioles are…

Answer 14

where myogenic muscular contraction is highly developed so flow is constant (autoregulation)

Question 15

pulse pressure =

Answer 15

systolic - diastolic pressure

Question 16

pulse pressure is proportional to

Answer 16

stroke volume

Question 17

pulse pressure is inversely proportional to

Answer 17

arterial compliance

Question 18

as velocity increases, kinetic energy … and pressure energy …

Answer 18

increases; decreases

Question 19

Describe aneurysm in terms of diameter, velocity, kinetic energy, and pressure energy

Answer 19

diameter increases, decrease velocity, decrease kinetic energy, increase pressure energy which further dilates vessel

Question 20

According to Pascal’s Principle pressure is

Answer 20

the same in all regions at equilibrium

Question 21

Wall tension (T) =

Answer 21

pressure (P) x radius (R)

Question 22

when pressure is constant then wall tension is … and radius is …

Answer 22

increased; increased