Arteries carry blood away from the heart, while veins return it. Blood vessels form two systems going to and from the heart. These two systems form the blood circulatory system.

New system may one day steer microrobots through blood vessels for disease treatment Researchers use a magnetic field to generate both side-to-side and corkscrew-like motions of tiny robots.

Two blood vessels unique to fetuses disappear. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Within seconds of birth, a baby takes in its ...

Walls of blood vessels may also become inflamed, limiting the uptake of oxygen. Whatever the cause, low oxygen levels may contribute to long Covid’s most common symptom, severe fatigue.