Pulmonary gas Exchange

Question 0

What law states that the amount of a given gas that dissolves in a given type of volume of liquid is directly proportional to the partial pressure of that gas at equilibrium?

Answer 0

Henry’s Law

Question 1

At sea level, how can the partial pressure of a specific gass in air be determined?

Answer 1

By multiplying the percent of the gas in the air mixture by 760mm Hg

Question 2

What law states that the total pressure exerted by the mixture of non-reactive gasses is equal to the sum of the partial pressures of individual gases?

Answer 2

Dalton’s law

Question 3

What law states that for a fixed amount of an ideal gas kept at a fixed temp, P(pressure) and V (volume) are inversely proportional

Answer 3

Boyle’s Law

Question 4

What happens when the addition of water vapor to the mixture of air in the alveoli decreases?

Answer 4

The partial pressures of all the other gasses in the mixture

Question 5

What is the normal alveolar pressure at the end of a quiet inspiration cycle?

Answer 5

0 mm Hg

Question 6

Normal Va/Q=

Answer 6

0.8 (pulmonary = 5 L/min; Ventilation= 4 L/min)

Question 7

Va/Q=0 when Va=0 but there is still perfusion…

Answer 7

this is is due to airway obstruction ( mucus plug). The blood gas composition remains unchanged.

Question 8

This is due to vascular obstruction(pulmonary embolism). Alveolar gas composition remains unchanged because there is no blood contact. This creates a physiological shunt.

Answer 8

VA/Q= infinity when Q= 0 but there is still ventilations( just no gas exchange)