In the 1966 novel Fantastic Journey, by Isaac Asimov, a miniature submarine and crew travel throughout the human circulatory ...

Exercise lowers blood pressure by making the heart stronger and increasing the elasticity of blood vessels. It can also help ...

Circulatory system During anaphylaxis, small blood vessels called capillaries start to leak blood into your tissues.

Researchers can use blood and urine tests to detect acid in the system. When a person takes LSD orally, the gastrointestinal system absorbs it and channels it into the bloodstream.

Caffeine can kick start your senses within 15 minutes. See exactly what caffeine does to your body with this interactive graphic.

Deep breathing exercises can help lower stress and promote relaxation. These effects can play a positive role in the management of chronic health conditions. We unpack the scientific research with ...

Learn about kidney disease, acute renal failure, and other kidney problems in dogs.

But I liked understanding the nuts and bolts of how things work. So as an undergraduate at Duke University, I knew I wanted ...