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Flashcards in Respiratory Physiology Deck (212)
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1

Respiration controls...

  • CO2 supply
  • O2 supply
  • Hion concentration

2

What is the outer form of respiration?

  • Gas exchange: outside world → Blood
    • Take-up + transmission of oxygen by cells
    • CO2 elimination
    • Gas exchange

3

Inner form of respiration

Gas exchange: Blood → Cells

4

99% of pulmonary blood supply comes from...

A. pulmonalis

5

99% blood leaves the lung via...

Vv. pulmonales → Left atrium

6

Which vessels represent the 'dual blood supply' of lung circulation?

  • A. pulmonalis (Functional)
  • A. bronchiales (Nutritive)

7

1% of pulmonary blood supply comes from...

Aa. bronchiales (Oxygenated)

8

Venous blood contaminates refreshed blood via ...

V. bronchiales

9

What transfers deoxygenated blood from the right ventricle to the lung?

A. pulmonales

10

From the aorta, ...transfers oxygenated blood to the lungs

A. bronchiales

11

Automatically decreased perfusion to certain areas of the lung leads to...

Redirection of blood to well-ventilated lung territories

12

Describe the physiology of blood redirection in the lung

Hypoxia causes vasoconstriction

13

A small portion of blood goes directly to the right atrium via...

V. azygos

14

Where does venous blood contaminate oxygenated blood?

  • V. bronchiales
  • Coronary vessels

15

Blood stays in the capillaries for...during 1 cardiac cycle

800 msec

16

O2 and CO2 diffusion takes how long to occur?

250 msec

17

pO2 (mmHg)

18

pCO2​ (mmHg)

19

Unit for airflow

Va/min

(Ventilation, litre air/ min)

20

Airflow is proportional to...

Perfusion of blood

21

Unit for perfusion of blood (Q)

litre/min

22

Normally: Va/Q =

1

23

In normal conditions, blood will flow away...

Arterialised (oxygenated)

24

When the alveolus is plugged...

  • Va = 0
  • Va/Q = 0
  • Blood flows away deoxygenated

25

Capillary plug

When blood flow stops

26

In the incidence of capillary plug...

  • Q=0
  • Va/Q = ∞
  • Alveolar gas pressure = atmospheric pressure

27

Degree of perfusion

Perfusion absent

28

Degree of perfusion

Perfusion is sporadic

29

Degree of perfusion

Perfusion is constant

30

Describe the effects of gravity in zone 1 of the lung

  • Pressure in alveoli compresses blood vessels
  • Perfusion decreases
  • PA > Pa> Pv