Anatomy & Physiology
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When an alveolus is insufficiently ventilated, what happens to the alveolar partial pressure of oxygen (Po₂) and the pulmonary arteriole serving that alveolus?
Po₂ rises, and the arteriole constricts
Po₂ drops, and the arteriole constricts
Po₂ rises, and the arteriole dilates
Po₂ drops, and the arteriole dilates