Question

The $pH$ of blood is maintained by $C{O}_2$ and $H_{2}C{O}_3$ in the body and chemical constituents of blood. This phenomenon is called:

• A. colloidal
• B. buffer action
• C. acidity
• D. salt balance

Answer 1

Answer: (B)

buffer action

The bicarbonate buffer system is an acid-base homeostatic mechanism involving the balance of carbonic acid (_{$H_2{CO}_3$}), bicarbonate ion ($H{CO}_3^{-}$), and carbon dioxide (${CO}_2$) in order to maintain $pH$ in the blood and duodenum, among other tissues, to support proper metabolic function.
Human blood contains a buffer of carbonic acid ($H_2{CO}_3$) and bicarbonate anion ($H{CO}_3^{-}$) in order to maintain blood $pH$ between $7.35$ and $7.45$, as a value higher than $7.8$ or lower than $6.8$ can lead to death. In this buffer, hydronium and bicarbonate anion are in equilibrium with carbonic acid.
conclusion: hence the option (B) Buffer action is correct.