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Human heart organoids model atrial fibrillation — Level A1 — a close up of a white substance on a blue background

Human heart organoids model atrial fibrillationCEFR A1

17 Dec 2025

LevelA1
A2
B1
B2

Adapted from Michigan State, Futurity • CC BY 4.0

Photo by National Institute of Allergy and Infectious Diseases, Unsplash

Level A1 – Beginner
1 min
56 words
  • 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 things
    models
  • lentil — a small round brown food seed
  • irregular — not steady or not in the usual time
  • vessel — a tube that carries blood or other liquid
    vessels
  • stem cell — a basic cell that can become other cells
    stem cells
  • immune cell — a body cell that helps fight infection
    Immune cells

Tip: hover, focus or tap highlighted words in the article to see quick definitions while you read or listen.

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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