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1. Red Blood Cells (RBCs) (Erythrocytes)
Function: RBCs transport oxygen from the lungs to the body and carry carbon dioxide back to the lungs for exhalation.
Key Component: Hemoglobin (a protein that binds oxygen).
Shape: Biconcave disc (helps in easy movement through blood vessels).
Lifespan: About 120 days.
Production Site: Bone marrow.
Color: Red (due to hemoglobin).
2. White Blood Cells (WBCs) (Leukocytes)
Function: WBCs are part of the immune system and help fight infections, bacteria, viruses, and other pathogens.
Types:
Neutrophils: Fight bacteria and fungi.
Lymphocytes: Include T-cells and B-cells for immunity.
Monocytes: Help remove dead cells and fight infections.
Eosinophils: Defend against parasites and allergens.
Basophils: Involved in allergic reactions.
Shape: Irregular (varies by type).
Lifespan: Few hours to several days.
Production Site: Bone marrow, lymph nodes, spleen.
Color: Colorless (they lack hemoglobin).
Key Differences
Both are essential for survival, working together to keep the body healthy and functioning properly.