NEET UG BIOLOGY MCQ: BREATHING AND EXCHANGE OF GASES

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C{O_2}

diffuses into …A… and forms

\mathrm{HCO}_3^ -

and

{H^ + }

. At the …B… site where

PC{O_2}

is low, the reaction proceeds in the opposite direction.
Thus,

C{O_2}

is trapped as …C… at the tissue level and transported to alveoli is released out as …D…
Select the right choice for A, B, C and D to complete the given NCERT statement

View answer and explanation

Correct option: B

A-RBC, B-alveolar, C-bicarbonate, D-

C{O_2}

The correct answer is B (A-RBC, B-alveolar, C-bicarbonate, D-

C{O_2}

) because carbon dioxide diffuses into red blood cells (RBCs) and forms bicarbonate ions. At the alveolar site, where

PC{O_2}

is low, the reaction proceeds in the opposite direction, and carbon dioxide is released.

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