Pulmonary arterial hypertension is caused by narrowing of the blood vessels in the lungs. Learn how it happens, including ...

Laid end-to-end, an adult's arteries, veins and capillaries would stretch for about 100,000 miles - enough to wrap around the world nearly four times. Each 2.54 square centimetre (a square inch ...

Welcome to the heart. The heart is a muscle which pumps blood non-stop through a huge network of blood vessels, delivering oxygen and nutrients to every part of the body. It has two sides ...

Your daily habits impact blood flow more than you realize. Learn how small changes in movement, hydration, and sleep can improve circulation.

Atherosclerosis is the buildup of plaque — a combination of cholesterol, fat, calcium, and blood elements — on and inside the walls of your arteries. Your arteries are the blood vessels that ...