Cantabria PAU Biology Practice Questions - Cantabria PAU Biology Examination - UNICAN (Biología 2o Bachillerato 2026) Exam

What is the main function of the bicarbonate buffer system (HCO3− / H2CO3) in human blood plasma?

To catalyze hydrolysis of plasma proteins during physiological exercise. To raise osmotic pressure by irreversibly precipitating calcium phosphate salts. To keep plasma pH within physiological limits (about 7.35–7.45). To transport dietary triglycerides directly to adipose tissue.

Correct Answer:

To keep plasma pH within physiological limits (about 7.35–7.45).

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