1. If the pressure between the visceral pleura of the lungs and the parietal pleura of the thoracic.

1. If the pressure between the visceral
pleura of the lungs and the parietal pleura of the thoracic cage is
_6mm Hg, then:

A. The lung will collapse.

B. Exhalation is occurring.

C. The pressure is above atmospheric
pressure.

D. The lungs will fill with air.

2. Boyles law states that the pressure
in an enclosed gas is inversely related to its volume. Which of the following
descriptions is compatible with Boyles law and with respiratory physiology?

A. As the sternum and ribs move
outwards, the volume of the chest increases. This causes an increase in the
enclosed

1. If the pressure between the visceral
pleura of the lungs and the parietal pleura of the thoracic cage is
_6mm Hg, then:

A. The lung will collapse.

B. Exhalation is occurring.

C. The pressure is above atmospheric
pressure.

D. The lungs will fill with air.

2. Boyles law states that the pressure
in an enclosed gas is inversely related to its volume. Which of the following
descriptions is compatible with Boyles law and with respiratory physiology?

A. As the sternum and ribs move
outwards, the volume of the chest increases. This causes an increase in the
enclosed air pressure. Hence, air is exhaled along the pressure gradient.

B. Bronchodilation expands the volume
enclosed by the bronchioles. This decreases the air pressure within them and so
atmospheric air moves into the lungs along the pressure gradient.

C. Diffusion of oxygen from alveolar air
into the blood decreases the partial pressure of oxygen in the lungs. This
decreased pressure allows atmospheric air to enter the lungs along the pressure
gradient.

D. As the diaphragm moves down, the
chest volume expands which decreases the pressure in that volume. Consequently,
atmospheric air is forced into the lungs along the pressure gradient.

3. Given that deoxygenated blood
entering the alveolar capillaries has an oxygen partial pressure of
42mmHg and a carbon dioxide partial pressure of 47mmHg, while the
partial pressures of O2 and CO2 in the alveolar air are 103mmHg and
40mmHg, respectively, which of the following gas movements will occur?

A. Both CO2 and O2 move from alveolar
air to the capillaries.

B. CO2 moves from alveolar air to
capillaries and O2 moves from capillaries to the alveolar air.

C. Both CO2 and O2 move from capillaries
to alveolar air.

D. CO2 moves from capillaries to
alveolar air and O2 moves from alveolar air to the capillaries.

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