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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![### Question 39
**Hydrogen ions are buffered in the venous blood of systemic circulation by _____.**
- [ ] water
- [ ] carbonic acid
- [ ] carbonic anhydrase
- [ ] hemoglobin
*(Note: This question appears on a quiz or test, asking about the buffering mechanisms for hydrogen ions in the venous blood of systemic circulation.)*
In the context of human physiology, it is essential to understand how the body regulates pH levels through various buffering systems. Hydrogen ions, which can significantly impact the pH of blood, are effectively managed by specific buffers to maintain homeostasis. The options provided in this question probe the student's knowledge of these buffering agents.
For detailed explanations:
- **Water** does not serve as a significant buffer for hydrogen ions.
- **Carbonic Acid** (H2CO3) is formed when carbon dioxide (CO2) dissolves in water, and while it plays a role in the carbonic acid-bicarbonate buffer system, it is not the primary buffering agent in venous blood.
- **Carbonic Anhydrase** is an enzyme that catalyzes the conversion of CO2 and water to carbonic acid, playing a crucial role in the maintenance of acid-base balance, but it is not a buffer itself.
- **Hemoglobin** in red blood cells can bind and release hydrogen ions, serving as a significant buffer in venous blood.
To answer this question correctly, one must identify that **hemoglobin** is the primary buffer for hydrogen ions in the venous blood of systemic circulation.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F8b11e5e3-ca74-4564-8378-11a1c3bc4648%2F1d73de59-c337-4e73-b30a-c760cb8bc0b7%2Fd8vo0t_processed.png&w=3840&q=75)
Transcribed Image Text:### Question 39
**Hydrogen ions are buffered in the venous blood of systemic circulation by _____.**
- [ ] water
- [ ] carbonic acid
- [ ] carbonic anhydrase
- [ ] hemoglobin
*(Note: This question appears on a quiz or test, asking about the buffering mechanisms for hydrogen ions in the venous blood of systemic circulation.)*
In the context of human physiology, it is essential to understand how the body regulates pH levels through various buffering systems. Hydrogen ions, which can significantly impact the pH of blood, are effectively managed by specific buffers to maintain homeostasis. The options provided in this question probe the student's knowledge of these buffering agents.
For detailed explanations:
- **Water** does not serve as a significant buffer for hydrogen ions.
- **Carbonic Acid** (H2CO3) is formed when carbon dioxide (CO2) dissolves in water, and while it plays a role in the carbonic acid-bicarbonate buffer system, it is not the primary buffering agent in venous blood.
- **Carbonic Anhydrase** is an enzyme that catalyzes the conversion of CO2 and water to carbonic acid, playing a crucial role in the maintenance of acid-base balance, but it is not a buffer itself.
- **Hemoglobin** in red blood cells can bind and release hydrogen ions, serving as a significant buffer in venous blood.
To answer this question correctly, one must identify that **hemoglobin** is the primary buffer for hydrogen ions in the venous blood of systemic circulation.
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