How Your Body Heals (Part 3)

What You'll Learn

Hormones are chemical messengers produced by glands that travel through the blood to target organs. They regulate growth, metabolism, mood, and many other body functions.

Key Words

respiratory system
organ system

Steps

Step 1 — Read

Study the diagram and label the parts you recognize.

Step 2 — Do

Build a model arm using cardboard tubes, string (tendons), and rubber bands (muscles). Show how muscles work in pairs to bend and straighten the elbow.

Step 3 — Observe

Compare the before and after states.

Step 4 — Record

Write your conclusion: did the results match your hypothesis? What would you change next time?

Check Your Understanding

Question 1

1 of 3

What does the brain do?