Red Blood Cell Structure. This enables oxygen and carbon dioxide to diffuse across the red blood cell’s plasma membrane more readily. Red blood cells contain enormous amounts of a protein called hemoglobin. This iron-containing molecule binds oxygen as oxygen molecules enter blood vessels in the lungs.
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If you observe a stained smear of human blood under a light microscope, you will see disc-shaped red blood cells, a variety of gaudily stained spherical white blood cells, and some scattered platelets that look like debris. Erythrocytes, or red blood cells, function primarily to ferry oxygen in blood to all cells of the body. Anucleate.