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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.
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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.
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What's the rarest blood type?Blood typing is particularly important for blood transfusions.
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'Ice printing' tiny sculptures could help scientists engineer blood vesselsA technique for printing 3D structures from ice could be used to help make artificial veins and arteries.
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1st partial-heart transplant growing with baby 1 year laterHeart valves transplanted as part of the first partial-heart transplant in a human are now growing along with the infant who received them.
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What is a heart murmur?Heart murmurs are extra, unusual sounds heard during a heartbeat — but why do they happen?
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Why do you get dizzy if you stand up too fast?It's normal for you to occasionally get dizzy and for your vision to go dark when you stand up, but it can sometimes be a sign of a chronic health condition.
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Why are some people's veins 'hard to find'?From stress to dehydration, there are many reasons why some people's veins may be "hard to find" when they're getting an infusion or blood draw.
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Fast-spinning ride at county fair triggers stroke in a young woman in unusual caseOnly 20 cases of stroke caused by being on an amusement park ride have been reported worldwide.
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