Atlas One · Host Biology · Scale 04 — Cellular

Erythrocyte

Anucleate biconcave disc (~7.5 µm). 250 million haemoglobin molecules carry 4 O₂ each; 25 trillion erythrocytes deliver ~250 mL O₂/min to tissues at rest. 120-day lifespan; removed by splenic macrophages. Erythropoietin (EPO) drives production in bone marrow.

Also known as: red blood cell, RBC, red cell, erythron

Scale 04 — CellularScale
draftStatus
2026-06-05Last Reviewed
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erythrocyte

Erythrocyte

Anucleate biconcave disc (~7.5 µm). 250 million haemoglobin molecules carry 4 O₂ each; 25 trillion erythrocytes deliver ~250 mL O₂/min to tissues at rest. 120-day lifespan; removed by splenic macrophages. Erythropoietin (EPO) drives production in bone marrow.