How Red Blood Cell Carry Oxygen and Carbon Dioxide, Animation

Red blood cells, or erythrocytes, are specialized cells lacking nuclei and organelles. Their biconcave donut shape and elastic structural proteins (actin and spectrin) allow them to efficiently navigate narrow capillaries.

Hemoglobin, the primary component, utilizes iron-rich heme groups to bind oxygen cooperatively. This process is reversible, triggered by oxygen partial pressure: binding occurs in oxygen-rich lungs and releases in oxygen-poor tissues.

Carbon dioxide is transported primarily as bicarbonate ions, a process catalyzed by carbonic anhydrase. Red blood cells manage the competitive binding of oxygen and carbon dioxide, facilitating efficient gas exchange between the lungs and body tissues.