16. The actual sites of gas exchange within the lungs are A. bronchioles. B. alv

Question

16. The actual sites of gas exchange within the lungs are A. bronchioles. B. alveolar ducts. C. pleural spaces. D. alveoli. E. terminal sacs 17. Type II alveolar cells A. allow rapid diffusion of gases through their thin membranes. B. secrete a chemical known as surfactant C. are phagocytic. D. allow rapid diffusion of gases through their thin membranes, secrete a chemical known as surfactant, and are phagocytic. None of the statements are true. E. Air entering the body is filtered, warmed, and humidified by the A upper respiratory tract B. lower respiratory tract C. lungs D. alveoli E. All of the answers are correct. 18. 19. Pulmonary surfactant A. keeps the alveoli from collapsing by reducing the surface tension. B. inflates the alveoli by increasing the surface tension C. inflates the alveoli by increasing the partial pressure of alveolar gas. D. keeps the alveoli from collapsing by increasing the surface tension E. increases the rate of gas exchange across the alveoli by the secretion of phospholipids Histamine's primary role in the respiratory system is as a A surfactant. B. bronchodilator. C. bronchoconstrictor. D. vasodilator E. vasoconstrictor. 20.

Explanation / Answer

Answer:-

16.option"D"-alveoli.

17.option "B"-secrete a chemical known as surfactant.

Explanation:-Type II alveolar cells cover a small fraction of thealveolar surface area. Their function is of major importance in the secretion of pulmonary surfactant, which decreases the surface tension within the alveoli.

18.option "A"-upper respiratory tract.

19.Option "A"-keeps the alveoli from collopsing by reducing the surface tension.

20.option "C"-bronchoconstrictor.

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