Red blood cells in plasma
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Red blood cells sample smear, floating in plasma, microscopy stylized, 3d illustration

"Red blood cells, also known as RBCs, red cells, red blood corpuscles, haematids, erythroid cells or erythrocytes (from Greek erythros for "red" and kytos for "hollow vessel", with -cyte translated as "cell" in modern usage), are the most common type of blood cell and the vertebrate's principal means of delivering oxygen (O2) to the body tissues—via blood flow through the circulatory system. RBCs take up oxygen in the lungs, or gills of fish, and release it into tissues while squeezing through the body's capillaries." Wikipedia, The Free Encyclopedia, "Red blood cell", https://en.wikipedia.org/wiki/Red_blood_cell
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