Researchers have reported growing hearts containing human cells in pig embryos for the first time. The embryos survived for 21 days, and in that time their tiny hearts started beating. The findings ...

The human heart, a fist-sized muscle, tirelessly beats billions of times throughout life, powering every cell by delivering oxygen and removing waste. Its rate varies significantly from birth to old ...

Developing new drugs is one of the riskiest and most expensive endeavors in science. Today, The Jackson Laboratory (JAX) ...

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 ...