Respiratory physiology (pressures, pleural pressure is always negative, preventing the lungs from collapsing)

1.      During expiration, the volume of the thorax __________ as the diaphragm __________.

a)      Decreases; contracts

b)     Decreases; relaxes

c)      Increases; contracts

d)     Increases; relaxes

2.      For inspiration to occur, barometric pressure must be __________ alveolar pressure.

a)      Greater than

b)     Less than

c)      Equal to

3.      If alveolar volume increases, alveolar pressure

a)      Decreases

b)     Increases

c)      Is unchanged

4.      If a pneumothorax occurs, pleural pressure and alveolar pressure become __________ barometric pressure.

a)      Equal to

b)     Greater than

c)      Less than

5.      The intrapleural pressure at rest is

a)      Positive

b)     Negative

c)      Greater than the atmospheric pressure

d)     Equal to the atmospheric pressure