- Scientists make small human heart models.
- The models are about lentil size.
- The models beat like a real heart.
- The models can show irregular beats called A‑fib.
- They have chamber‑like parts and vessels.
- Researchers use donated stem cells to make them.
- Immune cells help the heart parts form.
- Scientists test medicines with these models.
Difficult words
- model — a small copy used to study real thingsmodels
- lentil — a small round brown food seed
- irregular — not steady or not in the usual time
- vessel — a tube that carries blood or other liquidvessels
- stem cell — a basic cell that can become other cellsstem cells
- immune cell — a body cell that helps fight infectionImmune cells
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Discussion questions
- Would you like to see a small human heart model?
- Have you ever seen a model of a body or heart?
- Do you think testing medicine on models is good?
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