The pH
A. Of arterial blood normally ranges from 7.2 to 7.6.
B. Units express [H+] in moles/litre.
C. Of blood is directly proportional to the PCO2.
D. Of blood is directly proportional to [HCO3 – ].
E. Of urine is usually less than 7.
Here’s the evaluation of each statement:
A. Incorrect.The pH of arterial blood normally ranges from 7.35 to 7.45.
B. Correct. pH units express the concentration of hydrogen ions ([H+]) in moles per liter, where pH = -log[H+].
C. Incorrect.The pH of blood is inversely proportional to PCO2. As PCO2 increases, pH decreases.
D. Correct. The pH of blood is directly proportional to [HCO3–]. Higher bicarbonate levels contribute to higher pH.
E. Correct. The pH of urine is usually less than 7, indicating it is typically acidic.
So, the correct statements are B, D, and E.