Why do some researches believe that zone 2 conditions do not exist in the lungs with a person lying either prone or supine?
A. because the weight of the lungs is more evenly distributed
B. because the pulmonary vascular pressures increase
C. because of the decrease in functional residual capacity
D. because of the lungs reduced vertical dimension
?ANS: D
A. Incorrect response: See explanation D.
B. Incorrect response: See explanation D.
C. Incorrect response: See explanation D.
D. Correct response: Most authors agree that zone 1 conditions do not exist in normal persons. Zone 2 conditions occur in the upright and lateral positions; however, significant debate exists regarding the presence of zone 2 conditions in supine and prone positions. The reason is the lungs vertical dimension is greatly reduced in these two positions, especially compared with the upright and lateral orientations.
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