The Immune System: Body Defenders (Part 2)

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

Materials Needed

cotton balls
cups
different scented items
textured objects
timer

Safety First

Dispose of materials properly after the experiment.
Handle glass items carefully to avoid breakage.
Do not mix unknown chemicals together.

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?