Respiratory Values

Question 1

Systemic arterial PaCO2

Answer 1

40 mmHg

4-6kPa

Question 2

Basal oxygen consumption

Answer 2

250 ml/min

Question 3

Minute ventilation (at rest)

Answer 3

6 litres/min

Question 4

Alveolar ventilation (at rest)

Answer 4

4 litres/min

Question 5

PaO2

Answer 5

100 mmHg

11-13kPa

Question 6

By how many times does the presence of haemoglobin in normal arterial blood increase its oxygen concentration

Answer 6

X 70

Question 7

Systemic venous PaCO2

Answer 7

45 mmHg

Question 8

Alveolar PaCO2 at sea level

Answer 8

40 mmHg

Question 9

Alveolar pO2 at sea level

Answer 9

100 mmHg

Question 10

Systemic arterial pO2

Answer 10

98 mmHg

Question 11

The arterial-mixed (A-V) difference in pO2

Answer 11

60 mmHg

Question 12

Venous pO2 at sea level

Answer 12

40 mmHg

Question 13

Resting CO2 production

Answer 13

200 ml/min

Question 14

Tidal volume

Answer 14

0.5 L

Question 15

Expiratory reserve volume

Answer 15

1.5 L

Question 16

Inspiratory reserve volume

Answer 16

3 L

Question 17

Vital capacity

Answer 17

5L

Question 18

Functional residual capacity

Answer 18

2.5 L

Question 19

Total ventilation

Answer 19

7500 ml/min (of which 5250 ml/min is useful)

Question 20

Anatomical dead space

Answer 20

150 mL

Question 21

Average pressure in the pleural cavity

Answer 21

-6 H20

Question 22

Compliance of the lungs

Answer 22

200 ml/cmH2O

Question 23

Airways resistance

Answer 23

2 cm H2O/L/sec

Question 24

Peak expiratory flow

Answer 24

Around 500 L/min

Question 25

pO2 in a red blood cell entering a pulmonary capillary

Answer 25

40 mmHg

Question 26

Mean pressure in the pulmonary artery

Answer 26

15 mmHg

Question 27

Tissue pO2 can be as low as

Answer 27

1 mmHg

Question 28

Alveolar ventilation

Answer 28

5 L/min

Question 29

Maximum O2 consumption

Answer 29

3000 ml/min

Question 30

Number of bronchiole generations

Answer 30

23

Question 31

Number of alveoli

Answer 31

300 million

Question 32

Surface area of the lungs

Answer 32

70 m^2

Question 33

Maximum transmutation gradient before airways collapse

Answer 33

11 cm H2O

Question 34

Physiological dead space

Answer 34

0.15 L

Question 35

Ventilation perfusion ratio is

Answer 35

Normally around 0.8

Question 36

Dissolved O2

Answer 36

3 ml/L

Question 37

Number of times more soluble CO2 is in blood than O2

Answer 37

X 20

Question 38

Percentage of CO2 carried by carbaminohaemoglobin in blood

Answer 38

5%

Question 39

Percentage of CO2 carried by HCO3 in blood

Answer 39

90%

Question 40

Percentage of CO2 dissolved in the blood

Answer 40

5%

Question 41

Percentage of CO2 carried by carbaminohaemoglobin in venous-arterial difference

Answer 41

30%

Question 42

Percentage of CO2 as HCO3 in venous-arterial difference

Answer 42

60%

Question 43

Percentage of dissolved CO2 in venous-arterial difference

Answer 43

10%

Question 44

Arterial mixed venous (A-V) difference in pCO2

Answer 44

6 mmHg