Your sympathetic nervous system is one of the branches of your autonomic nervous system. It controls functions under unconscious control related to “fight or flight.” Your nervous system plays a ...

A computer-generated image of red blood cells. Nitric oxide—known by the formula NO—is so vital for humans’ internal physiological processes that it was crowned Molecule of the Year in 1992. It plays ...

The endocannabinoid system is found throughout the brain and body and plays a key role in everything from memory and learning to sleep to social behavior. During prolonged aerobic exercise, the body's ...