Blood Flow through the Vessels Flashcards

1
Q

radius is the most important factor for determining

A

the rate of blood flow

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2
Q

resistance is

A

inversely related to radius to the power of 4

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3
Q

removal of an organ

A

increases peripheral vascular resistance

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4
Q

amputation/organ donor

A

decreased conductance, increased resistance

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5
Q

if tumors >50um develop collateral system

A

increased conductance, decreased resistance

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6
Q

for parallel blood flow the SVR is..

A

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

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7
Q

sympathetic stimulation causes

A

constriction, greater pressure required for given flow

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8
Q

sympathetic inhibition causes

A

dilation, greater flow for given pressure

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9
Q

the pressure flow relation of vessels depends on

A

their amount of muscular and elastic tissue

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10
Q

muscular tissue confers

A

contractility

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11
Q

elastic tissue confers

A

distensibility

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12
Q

veins are …

A

highly distensible

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13
Q

large arteries are…

A

distensible by a reflex myogenic contraction occurs

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14
Q

arterioles are…

A

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

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15
Q

pulse pressure =

A

systolic - diastolic pressure

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16
Q

pulse pressure is proportional to

A

stroke volume

17
Q

pulse pressure is inversely proportional to

A

arterial compliance

18
Q

as velocity increases, kinetic energy … and pressure energy …

A

increases; decreases

19
Q

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

A

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

20
Q

According to Pascal’s Principle pressure is

A

the same in all regions at equilibrium

21
Q

Wall tension (T) =

A

pressure (P) x radius (R)

22
Q

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

A

increased; increased