Question

question 41
which of the following processes takes the least time to affect ph?
a bicarbonate buffer system
b urinary excretion of h+
c respiratory excretion of co₂
d physiologic buffer systems

Explanation:

The bicarbonate buffer system is a chemical buffer system that can immediately (within seconds) act to bind or release \(H^+\) ions to adjust pH. The respiratory excretion of \(CO_2\) (which affects carbonic acid - bicarbonate equilibrium) takes minutes. The urinary excretion of \(H^+\) takes hours to days. Physiologic buffer systems (like the bicarbonate buffer system is part of chemical buffer systems which act fast, but if considering the whole "physiologic" in a more general sense, the direct - acting bicarbonate buffer system is faster).

Answer:

A. Bicarbonate buffer system