Final Review: Pulmonary Gas Exchange

Question 0

What is Henry’s law?

Answer 0

The amount of gas that dissolves in a given volume of liquid is DIRECTLY proportional to the partial pressure of that gas at equilibrium

Question 1

How do you determine the partial pressure of a specific gas in air at sea level?

Answer 1

Multiply the percent of the gas in the air by 760 mmHg

Question 2

What is Dalton’s law?

Answer 2

The total pressure exerted by a mixture of non-reactive gasses is = to the sum of partial pressure of individual gasses

Question 3

What is Boyle’s law?

Answer 3

For a fixed amount of an ideal gas at fixed temperature, P and V are inversely proportional

Question 4

What does the addition of H2O vapor do to the mixture of air in the alveoli?

Answer 4

Decreases the partial pressures of all the other gasses in the mixture

Question 5

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

Answer 5

0 mmHg

Question 6

What is the normal Va/Q?

Answer 6

=0.8

Question 7

When is Va/Q equal to 0?

Answer 7

When Va=0 but there is still perfusion (airway obstruction)

Question 8

When is Va/Q equal to infinity?

Answer 8

When Q=0 but there is still ventilation (no gas exchange due to vascular obstruction)
No blood contact occurs so physiological shunt is created