The Immune System: Body Defenders

What You'll Learn

The immune system defends the body against disease-causing germs. White blood cells identify and destroy bacteria and viruses. Vaccines train the immune system to recognize specific threats.

Key Words

immune system
hormone
skeletal system

Materials Needed

paper
markers
tape

Safety First

Protect your work surface with newspaper or plastic.
Adult supervision recommended.
Do not taste any materials.

Steps

Step 1 — Read

Look at the vocabulary words and write a definition for each in your own words.

Step 2 — Do

Test your peripheral vision: stare straight ahead while a partner slowly moves a colored card from behind your head to the front. Record when you first see the color.

Step 3 — Observe

Draw a detailed diagram of what you observe.

Step 4 — Record

Write a conclusion: what did your results show? Did they match your prediction?

Check Your Understanding

Question 1

1 of 3

What is a reflex?