What does pH measure in the blood?

What does pH measure in the blood?

• A. The acidity of the blood; lower pH indicates more acidity, while higher pH indicates more alkalinity.
• B. The oxygen carrying capacity of blood.
• C. The level of carbon monoxide in blood.
• D. The amount of bicarbonate in blood.

Answer: (B)

pH measures how acidic or basic the blood is, i.e., the hydrogen ion concentration. It reflects the balance of acids and bases in the bloodstream and is normally maintained around 7.35–7.45. A lower pH indicates more acidity (higher H+), while a higher pH indicates more alkalinity (lower H+). This regulation happens mainly through the bicarbonate buffering system, along with respiratory and renal controls. The other options describe different blood properties: oxygen-carrying capacity depends on hemoglobin and oxygen saturation, carbon monoxide levels are a separate measurement, and bicarbonate amount influences pH but is not what pH directly measures.

pH measures how acidic or basic the blood is, i.e., the hydrogen ion concentration. It reflects the balance of acids and bases in the bloodstream and is normally maintained around 7.35–7.45. A lower pH indicates more acidity (higher H+), while a higher pH indicates more alkalinity (lower H+). This regulation happens mainly through the bicarbonate buffering system, along with respiratory and renal controls.

The other options describe different blood properties: oxygen-carrying capacity depends on hemoglobin and oxygen saturation, carbon monoxide levels are a separate measurement, and bicarbonate amount influences pH but is not what pH directly measures.