How Your Ears Hear (Part 5)

What You'll Learn

Ears detect sound waves that vibrate the eardrum. Tiny bones in the middle ear amplify vibrations, and the cochlea in the inner ear converts them into nerve signals.

Key Words

skeleton
muscle
nerve

Materials Needed

different scented items
textured objects
timer

Safety First

Be careful with scissors — ask an adult for help if needed.
Do not look directly at the sun or bright lights.

Steps

Step 1 — Read

Read and learn: Ears detect sound waves that vibrate the eardrum. Tiny bones in the middle ear amplify vibrations, and the cochlea in the inner ear converts them into nerve signals.

Step 2 — Do

Build your model using the materials provided.

Step 3 — Observe

Use your senses (except taste) to describe what you notice.

Step 4 — Record

Write a summary of your findings in 3-5 sentences.

Check Your Understanding

Question 1

1 of 3

What is the function of the heart?