Red Blood Cell & White Blood Cell Synonyms: Erythrocyte & Leukocyte

The standard medical terminology for blood cells uses Greek-derived names:

• Red Blood Cell (RBC) = Erythrocyte (Greek: erythros = red, kytos = cell). Primary function: O₂/CO₂ transport via hemoglobin.
• White Blood Cell (WBC) = Leukocyte (Greek: leukos = white, kytos = cell). Primary function: immune defense.

Major Subtypes

Erythrocytes

• Anucleate, biconcave discs, 7–8 µm diameter
• Lifespan ~120 days
• Produced in bone marrow (erythropoiesis) driven by EPO

Leukocytes (5 types)

• Neutrophils: Acute bacterial/fungal defense (phagocytosis, NETs)
• Lymphocytes: T cells (cellular immunity), B cells (antibodies), NK cells
• Monocytes/Macrophages: Phagocytosis, antigen presentation, tissue repair
• Eosinophils: Parasites, allergic inflammation
• Basophils: Histamine release, allergic response

Clinical Relevance

CBC with differential quantifies each. Terminology precision ensures clear communication in clinical and scientific contexts.