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Here are three simple ways to say it, using words a 5-year-old will understand:

  • The right side of the heart gathers blood that needs oxygen and sends it to the lungs to get fresh oxygen.
  • Think of the right side like a bus: it carries tired blood with little oxygen to the lungs so the blood can pick up oxygen.
  • The right half of the heart sends 'blue' blood to the lungs so it can come back 'red' after getting oxygen.

Very short step-by-step:

  1. The right side of the heart takes blood that doesn't have much oxygen.
  2. It pushes that blood to the lungs.
  3. The lungs give the blood fresh oxygen, and then the blood goes back to the heart to travel around the body.

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