Learn all about the human body's many systems and some of its individual organs, both vital and vestigial. When you purchase through links on our site, we may earn an affiliate commission. Here ...

The endocrine system consists of glands that make hormones. Your body uses hormones to control growth, development, metabolism, reproduction, mood, and other functions.

The largest muscle in the human body is the Gluteus Maximus. It is responsible for keeping your posture upright, and is the principal antigravity force working when you walk up stairs.

The human body is a wonderous thing, especially when you consider how intricate and efficient each bodily system is. For instance, an adult’s blood vessels could encircle the earth 2.5 times if ...

The Human Body's Nervous System. Clip: Episode 6 | 1m 22s Video has Closed Captions | CC. An introduction to the amazing functions of the human body's nervous system. This extremely advanced part ...

Digestive System Function. Digestion is the complicated process of turning the food you eat into nutrients, which your body uses for energy, growth, and cell repair.

Ask the three main branches of science what the human body is mostly made from and their answers sound like the punchline to a geeky joke. “Water,” says the biologist, giving a reply that has ...

Find out here what percentage of the human body is water. Also, discover why it varies, and why water is so important for the body's health.

The integumentary system is an important organ system in the human body, comprising of the skin, hair, nails, and glands that produce sweat and oil. Learn more.