50
Lesson 50 of 84 · The Human Body
ExperimentBreathing: The Respiratory System (Part 3)
What You'll Learn
The respiratory system brings oxygen into the body and removes carbon dioxide. When you breathe in, air enters the lungs where oxygen passes into the blood.
Key Words
- response
- reflex
- immune system
Materials Needed
- timer
- ruler
- paper
- markers
- tape
- mirror
Safety First
- Adult supervision recommended.
- Do not taste any materials.
- Wear safety goggles when mixing liquids.
Steps
Step 1 — Read
Study the diagram and label the parts you recognize.
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 3What does the respiratory system do?