Peripheral Vascular System--Nordgren Flashcards Preview

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Flashcards in Peripheral Vascular System--Nordgren Deck (22)
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1
Q

Net movement into capillary

A

reabsorption

2
Q

Net movement out of capillary

A

filtration

3
Q

2 types of pressure affecting movement through capillary walls

A

hydrostatic pressure (P): due to pressure

oncotic pressure (π): due to concentration of proteins, usually higher in capillaries

4
Q

Starling hypothesis

A

Net filtration rate = K[(Pc-Pi)-(πci)]

i = intersitial fluid

5
Q

Positive net pressure gradient indicates

A

filtration

6
Q

Negative net pressure gradient indicates

A

reabsorption

7
Q

Where does filtration occur in capillaries?

A

arterial end

8
Q

Where does reabsorption occur in capillaries?

A

venous end

9
Q

Why does filtration occur on arteriole end and reabsorption occur on venule end of capillaries?

A

decrease in hydrostatic pressure across capillary

10
Q

What does histamine do to capillaries?

A

makes them more leaky, proteins leak out and Starling forces dictate even more leaky capillaries –> less reabosorption

11
Q

What removes the proteins from the interstitial fluid?

A

lymphatic system

12
Q

Resistance of series calculation

A

Rs = R1 + R2 + ….

13
Q

Resistance of parallel network calculation

A

total radius of all elements put together

1/Rp = 1/R1 + 1/R2 + …

14
Q

Why does the velocity of blood through the capillaries slow compared to the arteries?

A

capillaries have a higher combined cross sectional area

15
Q

How can peripheral veins increase cardiac output?

A

contriction leads to increased preload

16
Q

What is the central venous pressure normal value

A

~0 mmHg

17
Q

Which piece of vasculature has the highest resistance to flow?

A

arterioles

18
Q

Total Peripheral Resistance Equation

(TPR)

A

calculated in parallel!

adding organ to system will decrease resistance

removing organ from system will increase resistance

19
Q

What is compliancy?

A

ability of veins to stretch

accomidates increases in volume

C = ΔV/ΔP

20
Q

Arteries have low compliancy

A

pressure resivours

small change in volume leads to high pressure change

elastic bounceback pushes blood through vasculature

21
Q

Mean Arterial Pressure

A

PA = CO x TPR

MAP = PD + 1/3 PP

MAP = 2/3 PD + 1/3 PS

22
Q

Greater compliance affects PP how?

A

greater compliance

–> less PP