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Physiology I Block 4 > Overview of Circulation > Flashcards

Overview of Circulation Flashcards

1
Q

Systemic circulation feeds the

A

body

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2
Q

pulmonary circulation feeds the

A

lungs

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3
Q

what has the majority of the blood

A

veins & venules

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4
Q

left side pressure

A

high

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5
Q

right side pressure

A

low

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6
Q

pulmonary circulation pressures are much

A

lower

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7
Q

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

A

tissue needs

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8
Q

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

A

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

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9
Q

cardiac output is controlled mainly by the sum of all

A

local blood flow

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10
Q

arterial pressure is controlled independently of:

A

local blood flow or cardiac output control

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11
Q

what determines blood flow through a vessel

A

ohms law

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12
Q

ohms law states that flow is dependent on

A

change in pressure over the resistance

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13
Q

ohms law equation:

A

Q = delta P/R

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14
Q

what does Q stand for in ohms law

A

flow

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15
Q

what does R stand for in ohms law

A

resistance

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16
Q

what does P stand for in ohms law

A

pressure difference

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17
Q

what equation governs flow throughout the body

A

ohms law: Q deltaP/R

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18
Q

most blood flows in the body by what type of flow

A

laminar flow

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19
Q

describe laminar flow

A

middle layer flowing faster than the outside ones

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20
Q

laminar flow, how does it sound

A

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

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21
Q

describe turbulent flow

A

causes murmurs

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22
Q

how does turbulent flow sound

A

causes sound, sounds like a murmur

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23
Q

how does turbulent blood flow flow?

A

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

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24
Q

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

A

it won’t flow

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25
Q

Flow =? (equation)

A

Flow = arterial - venous pressure/resistance

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26
Q

what is blood pressure

A

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

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27
Q

what determines blood pressure

A

how much volume is in the vessel

28
Q

where do we see the greatest drop in pressure

A

arterioles

29
Q

why do we see greatest drop in pressure in arterioles

A

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

30
Q

if arterioles constrict what happens to blood flow

A

less blood flows through them

31
Q

arterioles help contribute to

A

blood pressure

32
Q

if arterioles dilate what happens to blood flow

A

more blood flows through them

33
Q

what happens to blood pressure if arterioles constrict

A

it increases

34
Q

what happens to blood pressure of arterioles dilate

A

decreases

35
Q

what is resistance

A

impediment to blood flow in a vessel

36
Q

can resistance be directly measured

A

no

37
Q

Resistance = ? (equation)

A

deltaP/Q

38
Q

if you decrease resistance in organ, what happens to flow

A

increase

39
Q

pressure gradient of 100 and decrease resistance what happens to flow

A

increase

40
Q

increase resistance with pressure gradient of 100 what happens to flow

A

decrease

41
Q

systemic side circulation, pressure is

A

high

42
Q

why is systemic side circulation high

A

more resistance to blood flow

43
Q

look at pg 12

A

12

44
Q

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

A

pressure has to increase

45
Q

what is primary reason for resistance change

A

size or lumen of vessel

46
Q

flow is proportional to the ___ power of the radius

A

4th

47
Q

if diameter doubles, what happens to blood flow

A

see pg 13

48
Q

review pg 13

A

13

49
Q

what can change resistance besides pressure and radius

A

viscosity and length

50
Q

what does poisuille’s law say

A

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

51
Q

what does l stand for in poiseuille’s law

A

length

52
Q

longer vessel does what to resistance & flow

A

more resistance, less flow

53
Q

increase in viscosity does what to flow

A

decreases

54
Q

increase in viscosity does what to resistance

A

more

55
Q

when would you get viscosity decrease in regards to blood

A

anemia

56
Q

what happens to flow in anemia

A

increases

57
Q

R total series =?

A

R1 + R2+ R3 + R4

58
Q

how are our blood vessels arranged, series or parallele?

A

parallel

59
Q

R = ? in parallel

A

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

60
Q

adding another vessel in parallel does what to total resistance

A

decreases

61
Q

removing vessels does what to resistance in parallel

A

increase resistance

62
Q

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

A

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

63
Q

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

A

no

64
Q

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

A

goes up

65
Q

when venous return increases what does it do

A

increase cardiac output - it will stretch heart which increases CO

66
Q

more RBC will cause what to viscosity

A

increased viscosity

67
Q

go through the questios he gave us

A

pg 18-21

Physiology I Block 4 (13 decks)

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