Diffusion of Gases between Alveoli and Blood

Question 1

What do pulmonary arteries do?

Answer 1

Carry deoxygenated blood away from the heart to the lungs.

Question 2

What do pulmonary veins do?

Answer 2

Carry oxygenated blood towards the heart from the lungs.

Question 3

What does pulmonary circulation do?

Answer 3

Delivers CO2 to the lungs and pciks up oxygen

Question 4

How is the bronchial circulation supplied?

Answer 4

Via bronchial arteries arising from systemic circulation to supply oxygenated blood to lung tissues.

Question 5

How much of the left heart output does the bronchial circulation make up?

Answer 5

2%

Question 6

How does blood drain to the left atria?

Answer 6

Via pulmonary veins.

Question 7

What does the pulmonary circulation consist of?

Answer 7

Left and right pulmonary arteries originating form the right ventricle.

Question 8

What does the bronchial circulation supply the body with?

Answer 8

Nutritive supply, in supplying oxygen, supplying nutrients, enzymes, hormones.

Question 9

What is the main function of the pulmonary circulation?

Answer 9

Collecting oxygen and delivering CO2.

Question 10

Describe the flow and pressure of the pulmonary circulation.

Answer 10

Low pressure, high flow.

Question 11

A=?

Answer 11

Alveolar

Question 12

a=?

Answer 12

Arterial blood

Question 13

ṽ=?

Answer 13

Mixed venous blood

Question 14

Pa02=?

Answer 14

partial pressure of oxygen in arterial blood

Question 15

PACO2=?

Answer 15

partial pressure of carbon dioxide in alveolar air

Question 16

List the three things that the rate of diffusion across the cell membrane is proportional to.

Answer 16

-directly proportional to the available surface area
-directly proportional to the partial pressure gradient
-directly proportional to gas solubility

Question 17

When is the rate of diffusion over membranes the shortest?

Answer 17

Over short distances.

Question 18

What is the systemic pressure of the pulmonary arterial blood?

Answer 18

25mmHg

Question 19

What is the diastolic pressure of the pulmonary arterial blood?

Answer 19

8mmHg

Question 20

Why are the overall rates of diffusion fairly equal for oxygen and CO2?

Answer 20

CO2 diffuses more rapidly but O2 has a greater pressure gradient.