Cells get oxygen through a process called diffusion.
- Breathing in: When we breathe in, oxygen from the air enters our lungs.
- Oxygen in the lungs: The oxygen passes from the air sacs in the lungs into tiny blood vessels called capillaries.
- Red blood cells: Red blood cells, which contain a protein called hemoglobin, pick up the oxygen.
- Circulation: The oxygen-rich blood is then transported throughout the body by the circulatory system.
- Delivering oxygen: As the blood reaches the cells, the oxygen diffuses from the red blood cells into the cells, providing them with the energy they need to function.
This process ensures that every cell in the body has a continuous supply of oxygen.
