Overview of Circulation

Question 1

Systemic circulation feeds the

Answer 1

body

Question 2

pulmonary circulation feeds the

Answer 2

lungs

Question 3

what has the majority of the blood

Answer 3

veins & venules

Question 4

left side pressure

Answer 4

high

Question 5

right side pressure

Answer 5

low

Question 6

pulmonary circulation pressures are much

Answer 6

lower

Question 7

rate of blood flow to each tissue is almost always precisely controlled in relation to

Answer 7

tissue needs

Question 8

if you’re exercising and some tissues needs more blood, what happens to rate of blood flow to that tissue

Answer 8

it will be met - it will get more blood if it needs more blood

Question 9

cardiac output is controlled mainly by the sum of all

Answer 9

local blood flow

Question 10

arterial pressure is controlled independently of:

Answer 10

local blood flow or cardiac output control

Question 11

what determines blood flow through a vessel

Answer 11

ohms law

Question 12

ohms law states that flow is dependent on

Answer 12

change in pressure over the resistance

Question 13

ohms law equation:

Answer 13

Q = delta P/R

Question 14

what does Q stand for in ohms law

Answer 14

flow

Question 15

what does R stand for in ohms law

Answer 15

resistance

Question 16

what does P stand for in ohms law

Answer 16

pressure difference

Question 17

what equation governs flow throughout the body

Answer 17

ohms law: Q deltaP/R

Question 18

most blood flows in the body by what type of flow

Answer 18

laminar flow

Question 19

describe laminar flow

Answer 19

middle layer flowing faster than the outside ones

Question 20

laminar flow, how does it sound

Answer 20

silent - you don’t hear it flowing in your arm, etc

Question 21

describe turbulent flow

Answer 21

causes murmurs

Question 22

how does turbulent flow sound

Answer 22

causes sound, sounds like a murmur

Question 23

how does turbulent blood flow flow?

Answer 23

movement in opposite directions, the middle isn’t going faster than the rest like in laminar flow

Question 24

two pressures that are the same on both sides of vessel, what happens to blood flow

Answer 24

it won’t flow

Question 25

Flow =? (equation)

Answer 25

Flow = arterial - venous pressure/resistance

Question 26

what is blood pressure

Answer 26

force exerted by the blood against any unit area of the vessel wall

Question 27

what determines blood pressure

Answer 27

how much volume is in the vessel

Question 28

where do we see the greatest drop in pressure

Answer 28

arterioles

Question 29

why do we see greatest drop in pressure in arterioles

Answer 29

arterioles are resistance vessels of body - they can dilate or constrict

Question 30

if arterioles constrict what happens to blood flow

Answer 30

less blood flows through them

Question 31

arterioles help contribute to

Answer 31

blood pressure

Question 32

if arterioles dilate what happens to blood flow

Answer 32

more blood flows through them

Question 33

what happens to blood pressure if arterioles constrict

Answer 33

it increases

Question 34

what happens to blood pressure of arterioles dilate

Answer 34

decreases

Question 35

what is resistance

Answer 35

impediment to blood flow in a vessel

Question 36

can resistance be directly measured

Answer 36

no

Question 37

Resistance = ? (equation)

Answer 37

deltaP/Q

Question 38

if you decrease resistance in organ, what happens to flow

Answer 38

increase

Question 39

pressure gradient of 100 and decrease resistance what happens to flow

Answer 39

increase

Question 40

increase resistance with pressure gradient of 100 what happens to flow

Answer 40

decrease

Question 41

systemic side circulation, pressure is

Answer 41

high

Question 42

why is systemic side circulation high

Answer 42

more resistance to blood flow

Question 43

look at pg 12

Answer 43

12

Question 44

in pulmonary hypertension, to get same amount of blood to flow through vessels what has to happen?

Answer 44

pressure has to increase

Question 45

what is primary reason for resistance change

Answer 45

size or lumen of vessel

Question 46

flow is proportional to the ___ power of the radius

Answer 46

4th

Question 47

if diameter doubles, what happens to blood flow

Answer 47

see pg 13

Question 48

review pg 13

Answer 48

13

Question 49

what can change resistance besides pressure and radius

Answer 49

viscosity and length

Question 50

what does poisuille's law say

Answer 50

blood flow is affected by pressure differnece, radius, viscosity, length

Question 51

what does l stand for in poiseuille's law

Answer 51

length

Question 52

longer vessel does what to resistance & flow

Answer 52

more resistance, less flow

Question 53

increase in viscosity does what to flow

Answer 53

decreases

Question 54

increase in viscosity does what to resistance

Answer 54

more

Question 55

when would you get viscosity decrease in regards to blood

Answer 55

anemia

Question 56

what happens to flow in anemia

Answer 56

increases

Question 57

R total series =?

Answer 57

R1 + R2+ R3 + R4

Question 58

how are our blood vessels arranged, series or parallele?

Answer 58

parallel

Question 59

R = ? in parallel

Answer 59

1/Rtotal = 1/R1 + 1/R2 + 1/R3 + 1/R4

Question 60

adding another vessel in parallel does what to total resistance

Answer 60

decreases

Question 61

removing vessels does what to resistance in parallel

Answer 61

increase resistance

Question 62

what is the ultimate purpose of the parallel in regards to flow ad our body

Answer 62

Permits each tissue to regulate its own blood flow independently of flow to other tissues

Question 63

if blood flow to legs change will change to GI change?

Answer 63

no

Question 64

what happens to venous return if more blood flow goes to legs (and GI flow doesn't change)

Answer 64

goes up

Question 65

when venous return increases what does it do

Answer 65

increase cardiac output - it will stretch heart which increases CO

Question 66

more RBC will cause what to viscosity

Answer 66

increased viscosity

Question 67

go through the questios he gave us

Answer 67

pg 18-21