Biology: Concepts and Investigations
Biology: Concepts and Investigations
5th Edition
ISBN: 9781260259049
Author: Hoefnagels
Publisher: MCG
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Chapter 31.4, Problem 4MC
Summary Introduction

To analyze:

The relationship between the pH of the blood and how the brain sets the breathing rate.

Introduction:

Air exhaled by a person has a different gas composition than air absorbed by a person. The capillaries near the alveoli receive oxygen as a result of inhaling. Carbon dioxide is simultaneously transferred from capillaries to alveoli. But not for carbon dioxide, hemoglobin has a stronger affinity. Hemoglobin gains an increased affinity for oxygen when one carbon monoxide molecule attaches to it. To diffuse into the plasma, carbon dioxide becomes bicarbonate ions.

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The carbonic acid equilibrium is shown below. Exhalation of CO2 by the lungs causes this equilibrium to shift to the ______, which causes the pH of the blood to _______. H+ + HCO3-  <=> H2CO3  <=> H2O + CO2 a) left; increase b) left; decrease  c) right; decrease d) right; increase
What effect would a decrease in the pH of body fluids have on the respiratory rate?
Describe what happens with PCO2 levels and pH during normal breathing.
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