Pulmonary Blood Flow and Gas Exchange and Transport 1 Flashcards Preview

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Flashcards in Pulmonary Blood Flow and Gas Exchange and Transport 1 Deck (82)
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1

How does alveolar ventilation and compliance change with height from the base to the apex?

Both of them decline

2

Why does compliance decline with height from the base to the apex?

Alveoli are more inflated at FRC at the apex, since the ones at the base are more compressed

3

What does the alveoli at the apex being more inflated than the ones at the base mean for changes in intrapleural pressure?

Changes in pressure brings about bigger changes in alveolar volume at the base

4

What does the pulmonary vein carry?

Oxygenated blood from the lungs to the heart

5

What does the pulmonary artery carry?

Deoxygenated blood from the heart to the lungs

6

What are the 2 kinds of blood supply to the lungs?

Bronchial circulation

Pulmonary circulation

7

What is the purpose of bronchial circulation?

Supply the lungs with nutrients

8

What circulation supplies the lungs with nutients?

Bronchial circulation

9

What is bronchial circulation supplied via?

Bronchial arteries from systematic circulation to supply oxygenated blood to airway smooth muscle, nerves and lung tissue

10

What is the purpose of pulmonary circulation?

Gas exchange

11

What circulation is used for gas exchange?

Pulmonary circulation

12

What does pulmonary circulation consist of?

Left and right pulmonary arteries originating from the right ventricle

13

What does pulmonary circulation do?

Carries entire cardiac output from right ventricle, supplying dense capillary network surrounding the alveoli and returns oxygenated blood to the left atrium via the pulmonary vein

14

What kind of system is the pulmonary circulation?

High flow, low pressure

15

How does air diffuse across membranes?

Down its partial gradiants

16

What does gas exchange occur due to?

Presence of partial pressures

17

Where is the partial pressure of oxygen highest?

In arterial circulation

18

Where is the partial pressure of carbon dioxide highest?

In venous circulation

19

What does the abbreviation "A" mean in regards to partial pressures?

Alveolar

20

What does the abbreviation "a" mean in regards to partial pressures?

Arterial blood

21

What does the abbreviation "v" mean with regards to partial pressures?

Mixed venous blood (such as pulmonary artery)

22

What does PaO2 mean?

Partial pressure of oxygen in arterial blood

23

What does PACO2 mean?

Partial pressure of carbon dioxide in alveolar air

24

What does mixed venous blood (v) reflect the values of?

Values in tissue

25

What does arterial blood (a) reflect the values of?

Values of lungs

26

What rules does the diffusion of gases follow?

Rules for simple diffusion:

 

Moves across a membrane that is permeable to that gas

Moves down it's partial pressure grandient until equilbrium is reached

27

What must a membrane be for a gas to diffuse across it?

Permeable to that gas

28

When does a gas stop diffusing down it's concentration gradient?

When equilbrium is reached

29

What is the rate of diffusion across a membrane directly proportional to?

Partial pressure gradient

Gas solubility

Surface area

30

What is the rate of diffusion across a membrane inversely proportionate to?

Thickness of the membrane