Red blood cell — Free Biology Illustration

Biology

Red blood cell

A single normal human red blood cell shown face-on or slightly angled as a small, round biconcave disc with a smooth flexible membrane and clean circular outline. The cell is bright red to deep crimson or reddish pink, with a slightly darker, thicker outer rim and a paler, thinner depressed center that creates the classic donut-like appearance without an actual hole. Smooth rounded edges, subtle shading, and slight gloss emphasize the shallow central indentation on both sides. The cell lacks a nucleus, cell wall, and any visible internal organelles, and is presented as a simple isolated scientific or medical illustration.

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