The human heart is a vital organ that pumps blood through the body. You probably don't even think about it, but your heart is always working — it beats about 100,000 times a day, which adds up to about 3 billion beats over an average lifetime. Here's the latest science news about your ticker.
Latest about Heart & Circulation
Cholesterol-gobbling gut bacteria could protect against heart disease
Certain microbes in the gut microbiome may guard against heart disease by lowering people's cholesterol.
Never-before-seen cells unveiled in detailed map of developing human heart
The most comprehensive cell "atlas" of the developing human heart to date was crafted using cutting-edge technology and includes never-before-seen cell types.
Extreme exercise can pose risks. A cardiologist explains why.
Moderate exercise is good for the heart, but high levels of exercise can cause a phenomenon known as "athletic heart," which comes with risks.
Scientists developing new 'heart-on-a-chip'
So-called heart-on-a-chip systems may enable scientists to evaluate the safety and efficacy of new drugs more accurately than they can with animal tests.
What's the rarest blood type?
Blood typing is particularly important for blood transfusions.
'Ice printing' tiny sculptures could help scientists engineer blood vessels
A technique for printing 3D structures from ice could be used to help make artificial veins and arteries.
1st partial-heart transplant growing with baby 1 year later
Heart valves transplanted as part of the first partial-heart transplant in a human are now growing along with the infant who received them.
What is a heart murmur?
Heart murmurs are extra, unusual sounds heard during a heartbeat — but why do they happen?
