Question

Blood has a pH of

• A. 7.4
• B. 7.8
• C. 6.9
• D. 6.3

Answer 1

The correct option is A 7.4

Blood has a pH of 7.4. Blood that has a pH below 7.35 is too acidic, whereas blood pH above 7.45 is too basic. Blood pH, partial pressure of oxygen (p$O_2$), partial pressure of carbon dioxide (p$C{O}_2$), and $HC{O}_3^{-}$ are carefully regulated by a number of homeostatic mechanisms, which exert their influence principally through the buffer systems, respiratory system and the urinary system in order to control the acid-base balance and respiration.