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