The alveoli of mammalian lungs do not contain 20.9% O2 (that is, the percentage of O2 in atmospheric dry air) because A.there is dead space in the trachea and bronchial tree and the air in the lungs is humidified. B.mammals do not normally ventilate the lungs at a high enough rate. C.the trachea and bronchi are too small in volume to contain this amount of O2. D.mammal lungs have too many alveoli to ventilate. E.some O2 has been exchanged with the blood before reaching the alveoli.

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Answered: The alveoli of mammalian lungs do not…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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The alveoli of mammalian lungs do not contain 20.9% O₂ (that is, the percentage of O₂ in atmospheric dry air) because

	A.	there is dead space in the trachea and bronchial tree and the air in the lungs is humidified.
	B.	mammals do not normally ventilate the lungs at a high enough rate.
	C.	the trachea and bronchi are too small in volume to contain this amount of O₂.
	D.	mammal lungs have too many alveoli to ventilate.
	E.	some O2 has been exchanged with the blood before reaching the alveoli.

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