Lecture 7- Distribution of Ventilation and Lung perfusion

Question 1

Venous PO2

Answer 1

40mmHg

Question 2

Venous CO2

Answer 2

100mmHG

Question 3

Concentration gradient

Answer 3

driving force for moving o2 and co2, determined by partial pressure differences b/2 venous blood delivered to lung and alveolar gas

Question 4

Diffusion

Answer 4

rate of molecule movement, determined by concentration gradient, thickness of membrane, solubility of gas and permeability constant

Question 5

IS CO2 or O2 more soluable?

Answer 5

CO2

Question 6

Blood spends how long in pulmonary capillary?

Answer 6

.75s

Question 7

Transit time (increases/decreases) as Heart rate (increases/decreases)

Answer 7

decreases

increass

Question 8

Decreases in these conditions will affect effective alveolar surface area

Answer 8

1) Hindrance in alveolar wall (increases thickness)
2) decreases total lung area
3) uneven spread of air into the lungs
4) cardiac insufficiency