Digestion & Breathing

Sample questions

A taste of this unit. In the app, questions change every time and get easier or harder to match your child.

1. Question 1

   Put the parts of the digestive system in the order food travels through them.

   • 💧Large intestine: water is absorbed
   • 🩸Small intestine: nutrients pass into the blood
   • 🌀Stomach: acid and juices churn the food
   • 👄Mouth: teeth chew and saliva mixes in
   • ⬇️Esophagus: muscles squeeze food down
   Show answer

   Mouth: teeth chew and saliva mixes in → Esophagus: muscles squeeze food down → Stomach: acid and juices churn the food → Small intestine: nutrients pass into the blood → Large intestine: water is absorbed

   Hint: Food is chewed in the mouth, squeezed down the esophagus, churned in the stomach, then moves through the small intestine and finally the large intestine.

2. Question 2

   Which waste gas do you breathe out?

   💨
   • carbon dioxide
   • hydrogen
   • oxygen
   • helium
   Show answer

   carbon dioxide

   Hint: Your cells make carbon dioxide as waste. The blood carries it to the lungs, and you breathe it out.

3. Question 3

   Which part of digestion is a chemical change, not just a physical one?

   • teeth grinding food into small pieces
   • esophagus muscles pushing food down
   • the stomach churning food
   • saliva breaking starch down into sugars
   Show answer

   saliva breaking starch down into sugars

   Hint: Chewing and churning only make pieces smaller. Saliva actually changes starch into a new substance: sugar.

4. Question 4

   Which organ absorbs most of the nutrients from food into the blood?

   • the stomach
   • the esophagus
   • the small intestine
   • the large intestine
   Show answer

   the small intestine

   Hint: The small intestine is long and lined with tiny finger-like bumps that pass nutrients into the blood.

5. Question 5

   What is the diaphragm, and what does it do?

   • a dome-shaped muscle under the lungs that helps you breathe
   • a flap that covers the windpipe when you swallow
   • an organ that makes digestive juices
   • a tube that carries food to the stomach
   Show answer

   a dome-shaped muscle under the lungs that helps you breathe

   Hint: When the diaphragm tightens and moves down, the chest gets bigger and air rushes into the lungs.

6. Question 6

   Digestive system or respiratory system? Tap an item, then tap its basket.

   Sort into: 🍽️ digestive · 🫁 respiratory

   • 🍞small intestine absorbs nutrients
   • 🦷teeth grind food
   • 🔄alveoli swap oxygen and carbon dioxide
   • ⬇️esophagus pushes food down
   • 👃nose warms and filters air
   • 💨trachea carries air to the lungs
   Show answer

   🍽️ digestive: small intestine absorbs nutrients, teeth grind food, esophagus pushes food down · 🫁 respiratory: alveoli swap oxygen and carbon dioxide, nose warms and filters air, trachea carries air to the lungs

   Hint: The digestive system breaks down food. The respiratory system brings in oxygen and gets rid of carbon dioxide.

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