How Your Ears Hear (Part 2)

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

Materials Needed

textured objects
timer
ruler
paper
markers
tape

Safety First

Clean up spills immediately to prevent slipping.
Use materials only as directed in the experiment.

Steps

Step 1 — Read

Read the introduction and identify the main idea of this lesson.

Step 2 — Do

Map your taste zones: dip cotton swabs in salty, sweet, sour, and bitter solutions. Touch different areas of your tongue and record where each taste is strongest.

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?