About two-thirds of waste carbon dioxide is carried back to the lungs in higher animals by which method given below?
A)By red blood cells on the empty hemes
B)Dissolved in blood plasma as bicarbonate and hydrogen ions
C)Dissolved in lymph in lymph ducts
D)On myoglobins
E)None of the choices is correct

Question

Quizplus · Accepted Answer

Carbon dioxide is transported from the tissues to the lungs via the bloodstream in the form of bicarbonate ions (HCO3-) and hydrogen ions (H+), which are generated by the reversible reaction between carbon dioxide and water catalyzed by carbonic anhydrase enzyme. The majority of carbon dioxide in the blood (about 70%) is transported in this way.

About Two-Thirds of Waste Carbon Dioxide Is Carried Back to the Lungs