Video 5 Diffusion

Question 1

All gases cross the blood gas barrier by?

Answer 1

passive diffusion

Question 2

Diffusivity depends on (2)

Answer 2

1. solubility of the gas
2. molecular weight

Question 3

Volume of blood in the capillary? How much time is the blood in the capillary?

Answer 3

75 ml
0.75 sec

Question 4

What limits carbon monoxide across the blood gas barrier?

Answer 4

Diffusion properties of the blood gas barrier; diffusion limited

Question 5

What limits carbon nitrous oxide across the blood gas barrier?

Answer 5

Blood flow. It is perfusion limited

Question 6

How can you tell if a gas is diffusion vs perfusion limited?

Answer 6

Look at the difference in partial pressures between the alveolar gas and the end capillary blood. If no difference, perfusion limited. If any difference, diffusion limited

Question 7

T/F: Oxygen has a partial pressure in mixed venous blood

Answer 7

true

Question 8

Is the uptake of oxygen diffusion or perfusion limited?

Answer 8

It is equal to that of alveolar gas, therefore perfusion limited

Question 9

What disease process can affect diffusion of oxygen?

Answer 9

Fibrosis

Question 10

What is DL?

Answer 10

the diffusing capacity of a gas

Question 11

How does the pulmonary capillaries increase in size during exercise?

Answer 11

Extension and recruitment

Question 12

How to measure rate of reaction of oxygen with blood

Answer 12

spectro photometer

Question 13

Reduced hemoglobin is what color? oxygenated?

Answer 13

blue
red