Question

How are oxygen and carbon dioxide transported in humans?

Hint:

The majority of carbon dioxide is carried as bicarbonate ions in the blood, while oxygen binds to hemoglobin.

Answer 1

In humans, oxygen is carried by red blood cells as oxyhemoglobin, where oxygen binds to hemoglobin in the lungs and is transported to tissues. Carbon dioxide is transported back to the lungs in three forms: dissolved in plasma, bound to hemoglobin, and as bicarbonate ions (HCO3-) in the plasma.