Alveoli are coated by a thin film of _______, a substance that prevents the alveoli from collapsing.

Question

Quizplus · Accepted Answer

Surfactant is a substance that reduces surface tension and is present in the thin film coating the alveoli. It prevents the collapse of alveoli during exhalation, allowing for efficient gas exchange in the lungs. Mucus is a thick, sticky substance that lines the respiratory tract and traps particles, carbonic acid is a compound formed during respiration, and oxygen is a gas that is exchanged in the alveoli.

Alveoli Are Coated by a Thin Film of _______, a Substance