Match each physiological buffer system (1–4) with its primary location or physiological characteristic (A–D):

Buffer Systems:
1. Bicarbonate buffer system
2. Phosphate buffer system
3. Hemoglobin buffer system
4. Protein buffer system

Descriptions:
A. Principal chemical buffer in red blood cells that binds H+ during CO2 transport
B. Primary chemical buffer in the extracellular fluid (blood plasma and interstitial fluid)
C. Most abundant buffer system overall, acting primarily in intracellular fluid and plasma
D. Major buffer in the renal tubular filtrate and an important intracellular buffer

Question

Match each physiological buffer system (1–4) with its primary location or physiological characteristic (A–D):

Buffer Systems:
1. Bicarbonate buffer system
2. Phosphate buffer system
3. Hemoglobin buffer system
4. Protein buffer system

Descriptions:
A. Principal chemical buffer in red blood cells that binds H+ during CO2 transport
B. Primary chemical buffer in the extracellular fluid (blood plasma and interstitial fluid)
C. Most abundant buffer system overall, acting primarily in intracellular fluid and plasma
D. Major buffer in the renal tubular filtrate and an important intracellular buffer

Accepted Answer

1-B, 2-D, 3-A, 4-C. The material assigns these systems different physiological roles. Bicarbonate is prominent in plasma, phosphate is especially important intracellularly and in renal tubules, hemoglobin buffers in erythrocytes, and proteins contribute in plasma and cells. **Key takeaway:** Buffer importance depends on the fluid compartment and chemical context. **Glossary:** Erythrocyte: red blood cell.

Explanation

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