Lesson 19 (Part 3) Flashcards Preview

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Flashcards in Lesson 19 (Part 3) Deck (25)
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1

What is the driving force behind fluid flow?

Pressure

2

What is the formula for pressure?

P = F/A
P = pressure
F = force
A = area

3

What is pressure difference required for?

Fluid to flow

4

What is a pressure difference also known as?

Pressure gradient

5

What is the formula for pressure gradient?

Delta P = P2-P1

6

What is the unit for pressure? (2)

1. Pa
2. N/m^2

7

How does fluid flow?

From an area of high pressure to an area of low pressure

8

What does Q represent?

Volumetric flow rate

9

Volumetric flow rate?

Volume of blood passing a point per unit of time

10

What is the unit for Q?

mL/s

11

What is the formula for volumetric flow rate?

Q = delta P/R
Q = volumetric flow rate
P = pressure
R = resistance

12

What is Q applied?

To a long straight tube

13

What is the formula for resistance?

R = 8Ln/pie r^4
R = resistance
L = length of tube (cm)
n = viscosity
r = radius (cm)

14

What happens to the resistance when the length of the tube increases?

It increases also
- longer the tube the higher the resistance

15

What happens to the resistance when the viscosity increases?

It increases
- the higher the viscosity the higher the resistance

16

What happens to the resistance when the radius increases?

It decreases

17

Viscosity

Resistance to flow offered by a fluid

18

What is the unit for viscosity?

Poise

19

What is the viscosity of anemia compared to polycythemia?

It will be lower

20

What has the strongest effect on resistance of all the parameters?

Radius or diameter

21

What happens to the resistance if the radius doubles?

Resistance decreases by 16x

22

Vasoconstriction

Smaller blood vessels, so it restricts the blood flow

23

Vasodilation

Larger blood vessels, which allows more blood flow
- when it is needed

24

What is Poiseuille's equation?

Q=deltaP pie d^4/128Ln
- long straight tube

25

What is the formula for radius?

r = 1/2d
r = radius
d = diameter