4.Contraction of the diaphragm would cause:

a) a decrease in the volume of air in the lungs

b) an increase in airways pressure

c) a decrease in intrapleural pressure (i.e. the pressure is more negative)

d) an increase in alveolar pressure

e) a decrease in intra-abdominal pressure

5.Select one of the following which is NOT a normal value:

a) 19.5 ml O2/100 ml blood (arterial)

b) 14.5 ml O2/100 ml blood (venous blood, at rest)

c) 30 ml O2/100 ml blood (arterial, during voluntary hyperventilation)

d) 20.9 ml O2/100 ml air (atmospheric)

e) 40mm Hg pCO2 (alveolar air)

6.When blood is exposed to oxygen at a partial pressure of 100 mmHg it:

1) contains no oxygen in physical solution

2) carries approximately 20 ml of oxygen in each 100 ml.

3) shows large changes in saturation for small changes in oxygen tension about 100 mm Hg. 4) is nearly fully saturated.

1. a) only 1, 2 and 3 are correct
2. b) only 1 and 3 are correct
3. c) only 2 and 4 are correct
4. d) only 4 is correct
5. e) all are correct

ScholarMatic: Explanation & Answer

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