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Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892

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BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

The majority of CO2 in the blood:

a. is in the form of carbonic acid and bicarbonate ions.

b. dissociates to add H+ to the blood to raise its pH to 7.4.

c. has a lower P CO 2 than the P CO 2 in the alveolar air.

d. increases in the lung capillaries, which have a higher pH than the tissue capillaries.

e. can be displaced on the hemoglobin molecule by CO if CO isinhaled.

Summary Introduction

Introduction:

CO2 (carbon dioxide) is produced in the body cells by cellular respiration and diffuses from cells into the interstitial space. The partial pressure of CO2 in interstitial space is 46 mm Hg (millimeter of mercury), which is higher than PCO2 in blood entering the capillary network of the body. Thus, the CO2 diffuses from the interstitial site into the blood plasma.

Explanation

Justification for the correct answer:

Option (a) states that the majority of CO2 is in the form of carbonic acid and bicarbonate ions. This statement is correct because 60% of CO2 combines with water in the body and forms carbonic acid. The carbonic acid then dissociates into bicarbonates and H+ (hydrogen ions). Hence, option (a) is correct.

Justification for the incorrect answers:

Option (b) states that the majority of CO2 dissociates to add H+ to the blood to raise its pH to 7.4. However, when the CO2 dissociates into H+, it does not raise the blood pH. Its excess in blood will decrease the pH. However, it is removed from the blood by combining with hemoglobin or with plasma proteins to set pH to neutral at 7.4. So, it is an incorrect option.

Option (c) states that the majority of CO2 has lower PCO2 (partial pressure of carbon dioxide) than PCO2 in the alveolar air...

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