Skin: 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

muscular system
nervous system
circulatory system

Steps

Step 1 — Read

Read about The Human Body and write down three key facts.

Step 2 — Do

Test reaction time: have a partner drop a ruler and catch it. Record the centimeter mark 10 times. Calculate your average reaction time.

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 3

How many senses do humans have?