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