Lecture 24 - Pulmonary Gas Exchange Flashcards Preview

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Flashcards in Lecture 24 - Pulmonary Gas Exchange Deck (16):
1

What are the four major components of atmospheric air?

Nitrogen (78%), Oxygen (21%), argon (0.1%) and CO2 (0.03%)

2

The total pressure of a gas is equal to the _______.

sum of their partial pressures; Dalton's law

3

For a fixed volume of gas at a fixed temperature, volume is _____.

inversely proportional to pressure; Boyle's law

4

At a constant temperature, the amount of a gas that dissolves is directly proportional to the ____.

partial pressure of that gas; Henry's law

5

The calculate the partial pressure of a gas, the ideal gas equation is rearranged to __________.

P=nRT/V

6

To determine partial pressure of a gas, multiply the pressure in Torr (760 Torr = 1 atm) by____.

the decimal percentage of the gas

7

The partial pressure of O2 at the alveolar membrane is?

150 mmHg (760 Torr x 0.197)

8

According to Henry's law, the partial pressure of a dissolved gas is inversely proprtional to its:

solubility coefficient; if it is less soluble, it will have a lower partial pressure, as it does not dissolve readily

9

The partial pressure exerted from the escape of a gas from the liquid phase

A. partial pressure of sublimation
B. vapor pressure
C. solubility coefficient

B. vapor pressure

10

Upon exchange of gas in the alveoli, what components increase?

Carbon dioxide and water

11

Upon exchange of gas in the alveoli, what components decrease?

oxygen

12

Diffusion of a gas into a liquid is inversely proportional to?

distance of diffusion, sqrt(molecular wieght)

13

Diffusion of a gas into a liquid is directly proportional to?

partial pressure difference in pathway, cross sectional area to diffuse, solubility of the gas

14

Approximately ____ mL of new air is brought into the alveoli with each inspiration.

A. 100
B. 250
C. 350
D. 500

C. 350

15

The [O2]blood is controlled by what two factors?

Rate of absorption into the blood; rate of alveolar ventilation

16

Explain why carbon dioxide is more soluble than water.

Partial P = [dissolved gas]/solubility coefficient

The solubility coefficient of CO is much larger than O2, thereby exerting a smaller partial pressure than oxygen.