Q: About 20 percent of carbon dioxide is bound by hemoglobin and is transported where?


Read this paragraph and choose the correct option from the provided answers:

Carbaminohemoglobin About 20 percent of carbon dioxide is bound by hemoglobin and is transported to the lungs. Carbon dioxide does not bind to iron as oxygen does; instead, carbon dioxide binds amino acid moieties on the globin portions of hemoglobin to form carbaminohemoglobin, which forms when hemoglobin and carbon dioxide bind. When hemoglobin is not transporting oxygen, it tends to have a bluish-purple tone to it, creating the darker maroon color typical of deoxygenated blood. The following formula depicts this reversible reaction:.

 Choices:

- brain tissues

- intestines

- bones

- lungs


A:
lungs