Home Ask MCQ Quiz Contact Us Login

Ronan Asked :

21-11-2021 Spirometry

Q. What is the pH of Arterial blood?

A. 7.25
B. 7.30
C. 7.35
D. 7.40

Submit Your Answer

* You must be logged in to add answer.

Dapzoi Verified
Commented on 2021-11-21 12:19:47 (IST)
Answer: D

Explanation: Arterial blood has a pH of approximately 7.40. As venous blood acquires carbon dioxide, forms carbonic acid and hydrogen ions, the venous blood pH falls to approximately 7.36. This pH drop of 0.04 units occurs when the CO2 enters the tissue capillaries. When CO2 diffuses from the pulmonary capillaries into the alveoli, the blood pH rises 0.04 units to bring the normal arterial value of 7.40.