The Immune System: Body Defenders (Part 4)

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

nutrients
exercise
tissue

Steps

Step 1 — Read

Read and 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.

Step 2 — Do

Conduct the experiment by following the instructions.

Step 3 — Observe

Draw a picture of what you observe.

Step 4 — Record

Answer the questions based on your data.

Check Your Understanding

Question 1

1 of 3

What is a reflex?