- 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
Tip: hover, focus or tap highlighted words in the article to see quick definitions while you read or listen.
Related articles
Small RNA linked to cholesterol and heart disease
Researchers identified a small RNA, tsRNA-Glu-CTC, that helps control cholesterol by activating SREBP2. In mice, blocking the molecule lowered cholesterol and reduced atherosclerosis; human blood samples showed a similar association.
Gene Variant Raises Heart Failure Risk After Myocarditis in Children
A study found that a cardiomyopathy gene variant is more common in children who develop dilated cardiomyopathy after myocarditis. Researchers describe a "double hit" model and advise genetic testing to identify higher risk.
Cannabis smoking and processed-food diets raise heart risk
A lab study found that smoking hemp plus eating a processed, seed‑oil–rich diet may weaken the immune system and increase inflammation and heart damage. Researchers saw cannabis compounds build up in several organs.
Untreated Sleep Apnea Speeds Heart Aging and Raises Death Risk
A laboratory study using a long-term mouse model finds that untreated obstructive sleep apnea — recreated by repeated drops in oxygen during sleep — leads to faster cardiovascular aging and higher mortality. Researchers call for early screening and treatment.
Cell transplant may help heart after spinal cord injury
Researchers tested transplanting immature nerve cells into spinal cord injuries in rats. The transplants improved nerve control of circulation — stabilizing resting blood pressure and lowering heart rate — but hormonal responses after injury still rose.
Biodegradable patch may help heart heal after heart attack
Researchers report a biodegradable microneedle patch that delivers interleukin-4 to injured heart tissue. The local treatment encourages healing immune cells, reduces scarring, and may improve heart recovery while avoiding systemic side effects.