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Why do we need hemoglobin to transport oxygen in the bloodstream, but no protein is required...

Why do we need hemoglobin to transport oxygen in the bloodstream, but no protein is required to transport carbon dioxide in the blood from the tissues to the lungs? A. carbon dioxide is hydrophilic, and can interact with water molecules in the blood, but oxygen cannot B. the bonds in carbon dioxide are nonpolar covalent bonds, but the bonds in oxygen are polar bonds C. carbon dioxide is surrounded by a shell of sodium ions in the bloodstream, but oxygen is not D. oxygen is hydrophilic, and can form hydrogen bonds with water molecules in the blood, but carbon dioxide cannot E. carbon dioxide is amphiphilic, allowing it to form micelles in the blood, but hydrophobic oxygen cannot do this

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B. the bonds in carbon dioxide are nonpolar covalent bonds, but the bonds in oxygen are polar bonds

Explanation:Carbon dioxide (CO2) is nonpolar because it has a linear structure and have covalent bond. This property make it hydrophobic. As a result, they are more diffusible throught he cell membrane. And hence Most of the carbon dioxide diffuses into the RBCs where it combines with water to form carbonic acid which then dissociate to form Bicarbonate ions. In this Bicarbonate form, most of the CO2 is transported hence CO2 do not require any special protein for its transport.

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