New research finds there is significant variation in the anatomy of the human digestive system, with pronounced differences possible between healthy individuals. The finding has implications for ...

The urinary system helps maintain the volume and chemical composition of fluids in the body. One of the main organs in the system are the kidneys, which filter waste products out of the body through ...

For more than a century, textbooks and science websites have repeated a striking claim: the blood vessels inside a single ...

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 ...

The following outlines aspects of the female reproductive system, including the internal and external organs, the menstrual cycle, the egg, and reproductive hormones. The menstrual cycle is a monthly ...

The human body is often described as a marvel of “perfect design”: elegant, efficient and finely tuned for its purpose. Yet, when we look closer, a rather different picture emerges. Far from being a ...