From a tiny sample of tissue no larger than a grain of sand, scientists have come within reach of a goal once thought ...

The aorta, a large blood vessel responsible for transporting oxygenated blood from the heart to the rest of the body, plays a ...

Running forces your body to work against gravity. (Image credit: Getty Images) Running also tends to cause more dramatic spikes in heart rate, particularly during high-intensity sprints. "[This is ...

The circulatory system consists of one heart, five liters of blood, and approximately 96,000 kilometers of blood vessels, responsible for transporting nutrients and waste throughout the body.