4.3.3

Question 1

CHECK 699

Question 2

what are venous sinuses

Answer 2

flatted veins with thin walls

coronary sinus and dural sinuses

Question 3

how is backflow prevented in veins

Answer 3

valves ensuring one way flow

Question 4

why do veins have such large lumens

Answer 4

to ensure blood returns to heart

Question 5

how is blood pushed up hrough veins

Answer 5

SKELETAL MUSCLE CONTRACT

Question 6

why do we have arterial anastomoses

Answer 6

for alternate pathways

Question 7

where is arterial anastomoses commone

Answer 7

joints, brain, heart abdominal organ

Question 8

unit measurement of blood flow

Answer 8

ml/min

5l/min

Question 9

blood flow refers to

vessels

organs

entire circulation

all of the above

Answer 9

all of the above

Question 10

blood flow is equivalent to -_______ for the entire vasucalr systesm

entire body movement

cardiac output

cardiac input

Answer 10

cardiac output

Question 11

what is blood pressure

Answer 11

force per unit area exterted on the wall of a blood vessel

Question 12

what is the unit measurement for BP

Answer 12

mm Hg

Question 13

blood moves from ______ to ____ pressure

Answer 13

high to low

Question 14

what does the resistance measure

Answer 14

amount of friction blood encounters

Question 15

where is blood resistance encountered mostly

Answer 15

peripheral system circulation

Question 16

what are the three important sources of resistance

Answer 16

blood viscosity (formed elements, plasma protein)

total blood vessel length (longer = more resistance)

blood vessel diameter (site of regulation)

Question 17

main opportunity to change resistance is

Answer 17

diameter

Question 18

if the radius is doubled, the resistance is

Answer 18

1/16

1/(radius)^4

Question 19

what happens if a patient has fatty plaque from atherosclerosis

Answer 19

it dramatically increases resistance, disrupt laminar flow (turbulence)

Question 20

if pressure gradient increases, blood flow will

speed up

slow down

stay the same

Answer 20

speed up

Question 21

if resistance (R) increase blood flow will

speed up

slow down

stay the same

Answer 21

slow down

Question 22

what is the most important influencer on blood flow

Answer 22

resistance b/c it easily changes by altering blood vessel diameter

Question 23

how do we get pressure

Answer 23

flow is opposed by resistance

Question 24

systemic pressure is highest in the

vena cava

peripheral system

aorta

left atrium

Answer 24

aorta

Question 25

what is the pressure when blood is in the right atrium

Answer 25

0mm hg

Question 26

when does the steeped drop in blood pressure occur

Answer 26

in the arterioles

Question 27

what are the two factors that affect arterial blood pressure

Answer 27

elasticity

volume of blood forced into them

Question 28

what is systolic pressure

Answer 28

pressure exerted during ventricul constriction

Question 29

what is diastolic pressure

Answer 29

ventricular diastolis

Question 30

how do you calculate pulse pressure

Answer 30

difference of systolic and diastolic pressure

Question 31

what is the mean arterial pressure

Answer 31

pressure that propels blood to tissue

Question 32

how to calculate MAP

Answer 32

diastolic pressure + 1/3 pulse pressure

Question 33

what is the range for capillary blood pressure

Answer 33

15-35 mm Hg

Question 34

what happens if capillaries had high BP

Answer 34

would rupture

Question 35

is the change in venous BP little or large

Answer 35

little

Question 36

what is the pressure gradient for venous BP

Answer 36

15 mm Hg

Question 37

why is venous BP so low

Answer 37

cumulaitve effect of peripheral resistance

Question 38

what 3 factors aid in blood return from veisn

Answer 38

respiratory pump

muscular pump and valves

vasconstriction under sympathetic contro;