Multiple Choice
Which type of compound minimizes pH fluctuations in the fluids of living organisms?
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2. Water
Buffer Solution
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which buffer system accounts for approximately 75% of all chemical buffering in the body fluids?
A
Ammonia buffer system
B
Phosphate buffer system
C
Bicarbonate buffer system
D
Protein buffer system
Verified step by step guidance1
Step 1: Understand the concept of a buffer system. A buffer system helps maintain pH stability in a solution by neutralizing excess acids or bases. In the human body, buffer systems are crucial for maintaining homeostasis in body fluids.
Step 2: Review the major buffer systems in the body. These include the ammonia buffer system, phosphate buffer system, bicarbonate buffer system, and protein buffer system. Each has a specific role in regulating pH in different compartments of the body.
Step 3: Focus on the protein buffer system. Proteins, such as hemoglobin in blood, contain amino acid residues that can act as weak acids or bases. This allows them to bind or release hydrogen ions (H⁺), making them effective buffers.
Step 4: Recognize the significance of the protein buffer system. Proteins are abundant in body fluids and tissues, accounting for approximately 75% of all chemical buffering in the body. This makes the protein buffer system the most important and widespread buffering mechanism.
Step 5: Conclude that the protein buffer system is the correct answer based on its prevalence and role in maintaining pH stability in body fluids.
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