Biology: The Unity and Diversity of Life (MindTap Course List)
Biology: The Unity and Diversity of Life (MindTap Course List)
15th Edition
ISBN: 9781337408332
Author: Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher: Cengage Learning
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Chapter 38, Problem 10SQ

At high altitudes, _______.

  1. a. nitrogen bubbles out of the blood
  2. b. hemoglobin has fewer oxygen-binding sites
  3. c. there are fewer O2 molecules per unit volume of air than at low altitudes
  4. d. there is more carbon monoxide than at sea level
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Most oxygen transported in human blood______ . a. is bound to hemoglobin b. combines with carbon to form carbon dioxide c. is in the form of bicarbonate d. is dissolved in the plasma
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.
Which of the following situations occurs if a person's blood becomes more alkaline?   A. Hemoglobin molecules retain less oxygen per heme group under alkaline conditions than they do at neutral pH or under acidic conditions.   B. Hemoglobin molecules give up oxygen more readily under alkaline conditions than they do under neutral pH or under acidic conditions.   C. Hemoglobin molecules change shape and begin to lose oxygen molecules.   D. Hemoglobin molecules retain oxygen more readily under alkaline conditions than they do at neutral pH or under acidic conditions.   E. There is no change in hemoglobin's oxygen-binding affinity under alkaline conditions when compared to blood at neutral pH or under acidic conditions.
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