A class constructs a lung model to show where inhaled oxygen can pass into nearby blood. Which structure should represent that exchange surface?
AAlveoli✓ Correct
These air sacs lie at the site of exchange with pulmonary capillaries.
BDiaphragm✗ Incorrect
The diaphragm changes chest volume to move air; it is not the exchange surface.
CThoracic wall✗ Incorrect
The chest wall participates in breathing mechanics rather than serving as the blood-air exchange surface.
DPleural cavity✗ Incorrect
The pleural cavity is distinct from the alveolar air spaces where exchange occurs.
Answer
A. Alveoli
Rationale
Alveoli provide the air spaces adjacent to pulmonary capillaries. Ventilation supplies those spaces with air, making gas exchange possible.
RememberAlveoli are the lung's gas exchange air spaces.
Sources
Sources marked “Adapted from” are licensed under CC BY 4.0. We changed the material: its facts are rewritten into an original question, answer options and rationale. The original authors and publishers do not endorse SwipeExam.
Mechanics of VentilationSEER Training Modules, National Cancer Institute · License: US government work (public domain) · Retrieved · Mechanics of Ventilation
Bronchi, Bronchial Tree, & LungsSEER Training Modules, National Cancer Institute · License: US government work (public domain) · Retrieved · Bronchi and Bronchial Tree
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