Question

what would be the likely outcomes if thick layers of cells composed the alveolar walls? likely outcome low blood oxygen levels slower diffusion of oxygen into alveoli less efficient lungs slower diffusion of carbon dioxide into capillaries slower diffusion of oxygen into capillaries slower diffusion of carbon dioxide into alveoli faster diffusion of carbon dioxide out of capillaries faster diffusion of oxygen into capillaries

Explanation:

Alveolar walls are normally thin (single layer of cells) to enable fast diffusion of gases (O₂ into capillaries, CO₂ into alveoli). Thick layers increase diffusion distance, slowing both O₂ and CO₂ exchange. This reduces lung efficiency, leading to low blood oxygen levels. Incorrect options include faster diffusion (opposite effect) or misdirected diffusion (O₂ into alveoli is not the direction of gas exchange; CO₂ diffuses into alveoli, not capillaries).

Answer:

low blood oxygen levels, less efficient lungs, slower diffusion of oxygen into capillaries, slower diffusion of carbon dioxide into alveoli