Which type of pressure is necessary within the thorax to maintain normal inhalation and expiration?
a. Negative
b. Positive
c. Internal
d. Blunt
ANS: A
Negative, or subatmospheric, pressure is needed to avoid pressure changes that can be caused by openings in the thoracic wall. An uncontrolled opening in the thoracic wall can cause pressure change and be fatal.
Health Professions
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