How Your Body Works

Understand what cells are and why they are the fundamental units of life. Learn about their basic structure and how they create energy.

Discover how cells group together to form tissues, and how different tissues combine to create functional organs like the heart and lungs.

Explore how your brain, spinal cord, and nerves act as the body's rapid-fire communication network, controlling everything from thoughts to reflexes.

Follow the journey of food as it's broken down for energy and see how the circulatory system delivers fuel and oxygen to every part of your body.

Learn how your body's defense system identifies and fights off invaders like bacteria and viruses to keep you healthy.

Understand homeostasis, the crucial process your body uses to keep its internal environment stable, and the role hormones play as messengers.