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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332

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BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem
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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

Summary Introduction

Concept introduction: The delivery of oxygen to the cells plummets when people who live at low altitude ascend too fast to a high altitude. Cellular oxygen deficiency or hypoxia is the result of this case. People who stay in high altitudes for long time have adaptations that allow them to function in a low-oxygen environment. The physiological change that occurs in response to high altitude is called as acclimatization.

Explanation

Reasons for the correct answer:

In high altitudes, the atmospheric pressure decreases with the altitude. Oxygen accounts around 21% of the total pressure. At 5500 meters or 18000 feet, the air pressure will be half to that of the sea level.

Option c. is given as “there are fewer O2 molecules per unit volume of air than at low altitudes”. In higher altitudes, there are fewer oxygen per unit volume of air. Therefore, option c. is a correct answer.

Reasons for the incorrect answers:

Option a. is given as “nitrogen bubbles out of the blood”.

Nitrogen bubbles out of blood when a person returns to the water surface making a deep dive...

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