The component of blood that transports oxygen from the lungs to the rest of the body is the red blood cells (RBCs), using the protein hemoglobin.

Quick Scoop

Red blood cells contain the protein hemoglobin, which binds oxygen in the lungs and then carries it through the bloodstream to body tissues. As blood circulates, hemoglobin releases oxygen where it is needed and helps carry some carbon dioxide back to the lungs as waste.

  • Main carrier: Red blood cells (erythrocytes).
  • Key molecule inside them: Hemoglobin , which actually binds the oxygen.
  • Route: Lungs → heart → all body tissues via blood vessels.

In simple terms: red blood cells are the “delivery trucks,” and hemoglobin is the “cargo rack” that holds oxygen until it reaches your cells.

TL;DR: Oxygen is transported from the lungs to the rest of the body by red blood cells, thanks to hemoglobin inside them.

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