Researchers at Harvard and Emory University have created a biohybrid fish out of human heart muscle cells that can swim autonomously for months at a time as the cells beat. The project is a quirky ...

The heart is the body's hardest-working muscle. Whether you're awake or asleep, or exercising or resting, your heart is always at work. It pumps blood through arteries to deliver oxygen to organs and ...

Smoking affects the lungs and other organ systems, including the heart. The carbon monoxide from tobacco reduces oxygen to the heart, causing it to beat faster to deliver oxygen to the body. Share on ...

Monisha Ravisetti was a science writer at CNET. She covered climate change, space rockets, mathematical puzzles, dinosaur bones, black holes, supernovas, and sometimes, the drama of philosophical ...

A normal resting heart rate ranges from 60 to 100 bpm. Sudden increases can be triggered by stress, dehydration, or stimulants, says a heart specialist. Have you ever experienced a sudden increase in ...

Researchers grew a piece of a human heart in a lab. The new model isn't an entire heart. Instead, it's a model of the ventricle, one of the heart's major parts. The researchers say they reverse ...

The human heart beats roughly 3 billion times during the course of an average lifetime. Every single time it beats, blood is drawn into its two upper chambers, held there briefly by a network of ...