How is oxygen and carbon dioxide transported by blood in the human body?

1) oxygen forms an unstable compound with erythrocyte hemoglobin (oxyhemoglobin) in the capillaries of the lungs and is transported to organs and tissues
2) carbon dioxide in tissues and organs partially combines with the hemoglobin of erythrocytes and is transferred to the lungs
3) carbon dioxide dissolves in blood plasma and is transported to the lungs

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