Upper Exit, Lower Exit: teacher key

Burps and Farts, grade 8 edition, written for 8th grade. Gas leaves the body from two ends of the digestive tract, for two different reasons. Learn where each kind comes from and which foods change it.

Read the book. Print this page for the key.

Questions and answers

1. Where does belching release gas from?
   • The lower digestive tract
   • The lungs
   • The upper digestive tract (answer)
2. Which starch does not produce gas as it is broken down?
   • Corn
   • Rice (answer)
   • Potatoes
3. Why does gas that has no way out cause the belly to swell?
   • It is swallowed again
   • It turns into food
   • It is trapped in the digestive system (answer)
4. What does sphincter mean on these pages?
   • A ring-shaped muscle (answer)
   • A kind of gas
   • A part of a meal
5. Why do most burps not come from food in the stomach?
   • Burps come from the lungs
   • Most belching comes from swallowed air (answer)
   • Food is never in the stomach
6. What do sulfate reducers do?
   • Slow down burps
   • Make food taste sweet
   • Turn sulfate into hydrogen sulfide (answer)

Words

• esophagus: food tube
• sphincter: ring muscle
• bloating: belly swelling
• fructose: fruit sugar
• hydrogen: a light gas
• fermenting: breaking down food