There are 11 major organ systems inside the human body. These systems are the integumentary (skin), skeletal, muscular, nervous, endocrine, cardiovascular, lymphatic, respiratory, digestive, reproductive, and urinary.

The circulatory system is responsible for carrying your blood away from and back to the heart. It is made up of blood vessels, arteries, and veins that carry blood around your body. The circulatory system carries oxygen, nutrients and hormones to cells. It also removes waste products like carbon dioxide.

The Immune System helps you fight off sickness. The Immune System is made up of cells, tissues, and organs that work together to protect the body from disease or illness.

The digestive system allows your body to get the nutrients and energy it needs from the food you eat. Your digestive system starts working even before you begin eating. After you eat it will work on the food for hours, days or more depending on what you have eaten turning it into liquids. You can help your digestive system by drinking water and eating a healthy diet.

Grade 4-8 classroom game the circulatory system

Classroom Activity: build a healthy meal game

nutrition and exercise healthy heart game for kids

Really tough circulatory system quiz game

Circulatory System Quiz Game

Teachers: entire lesson plan how the circulatory system works

All Systems Go game

Match a Body System Game

The Body

A Ride through the Body

The Magic School Bus Human Body Tour

3D Human Anatomy

Major Organ Systems interactive

Organs Interactive

Enter and Look Around


Circulatory System

Digestive System

Muscular System

Nervous System

Immune System

Excretory System

Integumentary System (skin)

Lungs & the Respiratory System

The Interactive Body (games, bbc science)

The Human Body (flash)

Human Body Games

Science Games