When you get sick, what happens in your body to help you get better? In What Is the Immune System for Kids, you will learn how the human body fights against bad bacteria and viruses to keep it safe. And when you do get sick, certain parts of the immune system also help heal you and make you feel better. In fact, it is constantly working to battle bad germs that try to invade your body and attack you every day.

The parts that make up the immune system are the skin, white blood cells, and the lymph system. The skin is actually the body's first line of defense because it covers the whole body like a shield. This is why it's important to keep yourself clean. Since germs spread very easily by skin contact, washing your hands is one of the best ways to help prevent the spread of germs.

White blood cells are like "watchers" of the blood. They multiply constantly because they only live for a few weeks. There are three types of white blood cells, one of which specifically helps keep the body clean during the healing process. These are called macrophages. Another kind, lymphocytes, are the white blood cells that attack infections. Different types of lymphocytes have different responsibilities. Some find hidden germs and unhealthy cells and destroy while others produce antibodies to fight specific germs.

Did you know that sometimes the immune system fights against good things? When it thinks a particular food, for instance, is bad, it will attack it, causing symptoms like sneezing, itching, hives, or other reactions. In other words, it causes allergies and an allergic reaction. When the immune system attacks healthy cells because it mistakes them for unhealthy, it means the body suffers from an autoimmune disease.

We hope you and your student(s) enjoyed learning about how our bodies protect us! If you want to learn even more, head over to our website and download one of our many free lesson plans about the human body, full of activities, worksheets, and more!

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What you will learn in What Is the Immune System for Kids:
0:00 Introduction to the immune system
0:51 What the immune system is and how it works
1:36 First layer of defense: the skin
2:02 White blood cells: Neutrophils, macrophages, lymphocytes
2:47 T-cells and B-cells
3:48 How the lymph system works
4:19 Not all germs are bad and how vaccines work
5:20 Allergies, autoimmune diseases, and how to help your immune system
6:26 Review of the facts

Check out some of our other immunity-related videos here:
Germs:    • Germs for Kids | Learn all about bact...  
Bacteria and Viruses:    • Bacteria and Viruses for Kids | Learn...  

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