What does thoracic wall compliance measure?
AThe speed at which the ribs recoil inward
BThe force the diaphragm can generate at rest
CHow well the chest wall stretches under pressure
DThe volume of air left after full exhalation
Answer & Solution
Correct answer: C. How well the chest wall stretches under pressure
1. Inspiration requires the thoracic cavity to expand.
2. Thoracic wall compliance is the ability of that wall to stretch while under pressure.
3. If the tissues are not very compliant, expanding the thorax to enlarge the lungs becomes difficult.
4. The volume left after full exhalation is the residual volume, which is a lung volume rather than a compliance measure.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 22 "The Respiratory System", section 22.3 The Process of Breathing_
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