Red blood cells (RBCs) carry oxygen from the lungs to all body tissues and bring carbon dioxide back for exhalation. They contain a pigment called hemoglobin, which binds with oxygen to form oxyhemoglobin. Their disc shape increases surface area for gas exchange, making them super efficient at oxygen transport.

Remember

• Main role: Oxygen transport.
• Lifespan: Around 120 days.
• Produced in bone marrow