Multiple choice

pH of blood in arteries and veins is

  1. more in veins and less in arteries

  2. more in arteries and less in veins

  3. same

  4. not definite
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Arterial blood has a higher pH (more alkaline, ~7.45) than venous blood (~7.35) because arterial blood carries oxygen and has less carbon dioxide. Venous blood returning from tissues has accumulated CO2 and metabolic waste, making it slightly more acidic. The pH difference is small but physiologically significant. They are not the same, and the difference is definite and consistent in healthy circulation.

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