Learn all about the human body's many systems and some of its individual organs, both vital and vestigial.

There are four anatomical sling systems of the body, and we asked a strength and conditioning coach to explain each one, including how to exercise them and build a stronger body.

The system of blood vessels in the human body measure about 60,000 miles (96,560 kilometers). Arteries carry oxygen-rich blood from the heart through the body.

The Human BodyEach organ in your body’s 11 organ systems work so you can perform activities like breathing, digestion, and movement.

The human body is a walking wonder—packed with secret features, bizarre abilities, and mind-blowing facts that most people have never even heard of.From strange built-in defenses to mysterious inner ...

The five vital organs in the human body are the brain, heart, lungs, kidneys, and liver. Other organs include the gallbladder, pancreas, and stomach. Organ systems, such as the nervous system ...

An introduction to the amazing functions of the human body's nervous system. This extremely advanced part of our biology is always at work interpreting the world we encounter and helping us decide ...

Among the most impressive systems of the body is the musculoskeletal system. But how many muscles are in the human body?

The respiratory system is responsible for the exchange of carbon dioxide and oxygen in the human body. This system also helps remove metabolic waste products and keep pH levels in check.

1st level Science Body systems learning resources for adults, children, parents and teachers.