Digestion: From Food to Fuel (Part 3)

What You'll Learn

The digestive system breaks food into nutrients the body can use. Food travels from the mouth through the esophagus, stomach, and intestines, with nutrients absorbed along the way.

Key Words

reflex
immune system

Materials Needed

stethoscope (toy)
sponge
water

Safety First

Handle glass items carefully to avoid breakage.

Steps

Step 1 — Read

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

Step 2 — Do

Build a model of the respiratory system using a plastic bottle, balloons, and a straw. Show how the diaphragm helps you breathe.

Step 3 — Observe

Look for patterns in your observations.

Step 4 — Record

Make a graph or chart showing your results.

Check Your Understanding

Question 1

1 of 3

What carries oxygen in the blood?