Which of the following statements are true of the alveoli and pulmonary capillaries? (Read carefully and select all of the correct statements.) A)Blood coming into the pulmonary capillaries is low in O₂ and high in CO₂. B)The alveolar walls are one cell in thickness. C)The total alveoli provide a large surface area for gas exchange. D)The pulmonary capillaries are made of simple squamous epithelium. E)Type II alveolar cells secrete pulmonary surfactant to increase the osmosis of gases. F)Blood leaving the pulmonary capillaries will return to the left atrium of the heart.

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Blood entering the pulmonary capillaries is low in O2 and high in CO2. Alveolar walls are one cell thick, providing a large surface area for gas exchange. Pulmonary capillaries are made of simple squamous epithelium. Blood leaving the pulmonary capillaries returns to the left atrium. Type II alveolar cells secrete surfactant to reduce surface tension, not to increase osmosis of gases.

Which of the Following Statements Are True of the Alveoli