Lousielle extras

Question 1

Charles Law

Answer 1

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Question 2

Boyles Law

Answer 2

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Question 3

STPD

Answer 3

Standard Temp Pressure Dry

Question 4

Difference between anatomical and physiological Dead space

Answer 4

Anatomical: 150mL or 1/3 VT. COnducting zone of trachea to terminal bronchiole

Physiological: Alveolar space that is ventilated but not perfused and therefore doesn’t undergo gas exhange + normal dead space

Question 5

Bohrs equation and what does this equation assume?

Answer 5

1) assumes that inspired CO2= 0
2) assumes that VT= VA + VD
3) PACO2 = PaCO2
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Question 6

Poiseuille-Hagen Law. What does this approximate?

Answer 6

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Laminar flow

Question 7

Resistance equation

Answer 7

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Question 8

laminar flow vs turbulent flow

Answer 8

In turbulent, a much larger pressure gradient is required to achieve a given flow

Question 9

To get air in you need to overcome lungs ______ and _________

Answer 9

To get air in you need to overcome lungs compliance and resistance to airflow

Question 10

Saturation water pressure

Answer 10

47mmHg or 6.3kPa

Question 11

Units of compliance

Answer 11

L.(cmH20^-1)

Question 12

Compliance is dependent on

Answer 12

1) elasticity of the lung

2) air-water surface tension

Question 13

Cspecific equation

Answer 13

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Question 14

Laplace’s Law

Answer 14

P proportional T/r

Question 15

What can increase compliance?

Answer 15

Pulmonary oedema
Fibrosis
Deficiency of pulmonary surfactant
Atelectasis

Question 16

FRC is ___% of TLC

Answer 16

FRC is ~40% of TLC

Question 17

Draw the ‘Equation of motion’ for both elastance AND compliance

Answer 17

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Question 18

Daltons Law

Answer 18

The total pressure exerted by a mixture of gases is equal to the sum of partial pressures of each individual gas present

Question 19

PO2gas = PO2liquid = FO2 x PB

Answer 19

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Question 20

Henrys law

Answer 20

Content = solubility x pressure

Question 21

Solubility of CO2 vs O2

Answer 21

Solubility of CO2 = 60mL/L (100mmHg)

Solubility of O2 = 3mL/L (100mmHg)

Question 22

Types of Anatomical Shunts

Answer 22

1) Most of the bronchial circulation
2) Thesbian component of the coronary circulation
3) Pulmonary Arteriovenous fistula
4) Patent Ductus arteriosis
5) Patent foramen ovale

Question 23

Physiological Shunts

Answer 23

any admicture of mixed (systemic) blood with blood from the pulmonary capillaries