76
Lesson 76 of 84 · Information Processing
ExperimentSkin: Your Largest Organ (Part 4)
What You'll Learn
The excretory system removes waste products from the body. The kidneys filter blood to produce urine, the lungs remove carbon dioxide, and the skin releases some waste through sweat.
Key Words
- heart
- lung
Materials Needed
- stethoscope (toy)
- sponge
- water
- blindfold
- cotton balls
- cups
Safety First
- Adult supervision recommended.
- Do not taste any materials.
- Wear safety goggles when mixing liquids.
Steps
Step 1 — Read
Read and learn: The excretory system removes waste products from the body. The kidneys filter blood to produce urine, the lungs remove carbon dioxide, and the skin releases some waste through sweat.
Step 2 — Do
Compare your results with a partner.
Step 3 — Observe
Watch carefully for any changes and note the time.
Step 4 — Record
Create a data table to organize your measurements.
Check Your Understanding
Question 1
1 of 3How many senses do humans have?