Crash course. Look at the human body

Learn about the circulatory system, which carries blood to and from the heart and moves oxygen, nutrients, and more throughout the body.

The skeletal system is more than bones-- it also includes cartilage, ligaments, and tendons, working together.

The nervous system carries messages from the brain to all the parts of the human body-- all faster than you can blink!.

Muscles help us move from place to place, but they also help important parts of our bodies work, keeping us alive and well.

The chemical messengers of the human body are known as hormones, and they impact every part of the body.

Learn the ins and outs of the human digestive system, which breaks down food into nutrients and removes waste from the body.