Hemoglobin is a protein in red blood cells that carries oxygen from the lungs to the rest of the body and brings carbon dioxide back to the lungs to be exhaled. It is what makes blood red and is essential for transporting oxygen to tissues and organs. Each hemoglobin molecule can carry up to four oxygen molecules, helping to ensure that the body's cells receive the oxygen they need to function properly.

“hemoglobin”的英语定义和含义

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