The statement that describes the alveolus shown in Figure 1-1 is which of the following?
1. Requires more time to fill than a normal alveolus.
2. Fills more quickly than a normal alveolus.
3. Requires more volume to fill than a normal alveolus.
4. More pressure is needed to achieve a normal volume.
a. 1 and 3 only
b. 2 and 4 only
c. 2 and 3 only
d. 1, 3, and 4
ANS: B
The figure shows a low-compliant unit, which has a short time constant. This means it takes less time to fill and empty and will require more pressure to achieve a normal volume. Lung units that require more time to fill are high-resistance units. Lung units that require more volume to fill than normal are high-compliance units.
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