Question

Fear and excitement generally cause one to breathe rapidly and it results in the decrease of ${CO}_2$ concentration in blood. In what way will it change and pH of the blood?

• A. pH will decrease
• B. pH will increase
• C. No change
• D. pH will adjust to $7$

Answer 1

The correct option is B pH will increase

The blood contains the buffer system of $NaHC{O}_3$ and $H_{2}C{O}_3.$The carbon-dioxide is present in blood and the $pH$ is balanced and maintained so as to resist the change in $pH.$

When there is a decrease in $C{O}_2$ concentration, the acidic content decreases relative to basic content and the $pH$ will increase.