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Physics 1 > Lesson 19 (Part 3) > Flashcards

Lesson 19 (Part 3) Flashcards

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1
Q

What is the driving force behind fluid flow?

A

Pressure

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2
Q

What is the formula for pressure?

A 
P = F/A
P = pressure 
F = force 
A = area
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3
Q

What is pressure difference required for?

A

Fluid to flow

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4
Q

What is a pressure difference also known as?

A

Pressure gradient

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5
Q

What is the formula for pressure gradient?

A

Delta P = P2-P1

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6
Q

What is the unit for pressure? (2)

A
  1. Pa

2. N/m^2

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7
Q

How does fluid flow?

A

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

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8
Q

What does Q represent?

A

Volumetric flow rate

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9
Q

Volumetric flow rate?

A

Volume of blood passing a point per unit of time

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10
Q

What is the unit for Q?

A

mL/s

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11
Q

What is the formula for volumetric flow rate?

A 
Q = delta P/R
Q = volumetric flow rate 
P = pressure 
R = resistance
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12
Q

What is Q applied?

A

To a long straight tube

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13
Q

What is the formula for resistance?

A 
R = 8Ln/pie r^4
R = resistance 
L = length of tube (cm)
n = viscosity 
r = radius (cm)
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14
Q

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

A

It increases also

- longer the tube the higher the resistance

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15
Q

What happens to the resistance when the viscosity increases?

A

It increases

- the higher the viscosity the higher the resistance

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16
Q

What happens to the resistance when the radius increases?

A

It decreases

17
Q

Viscosity

A

Resistance to flow offered by a fluid

18
Q

What is the unit for viscosity?

A

Poise

19
Q

What is the viscosity of anemia compared to polycythemia?

A

It will be lower

20
Q

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

A

Radius or diameter

21
Q

What happens to the resistance if the radius doubles?

A

Resistance decreases by 16x

22
Q

Vasoconstriction

A

Smaller blood vessels, so it restricts the blood flow

23
Q

Vasodilation

A

Larger blood vessels, which allows more blood flow

- when it is needed

24
Q

What is Poiseuille’s equation?

A

Q=deltaP pie d^4/128Ln

- long straight tube

25
Q

What is the formula for radius?

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

Physics 1 (42 decks)

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