The Sorting System: teacher key

Poop and Pee, grade 8 edition, written for 8th grade. Your body keeps what it needs and sends the rest out as poop and pee. Follow food through the stomach, small intestine and bile, then follow blood through the kidney's filters, and meet the muscles and wombat cubes along the way.

Read the book. Print this page for the key.

Questions and answers

1. What does bile do to fats?
   • Turns them into protein
   • Filters them out of the blood
   • Breaks them into tiny droplets (answer)
2. What did scientists learn from mimic intestines?
   • Shoving beads through made cubes
   • Contractions of stiff and soft parts produced flat sides and corners (answer)
   • Wombats eat cubes
3. What does the word emulsify mean in this book?
   • Squeeze food along
   • Filter blood
   • Break fat into tiny droplets (answer)
4. Why can you choose when to open the outer anal sphincter?
   • The stomach tells it to
   • It is a muscle you can control on purpose (answer)
   • The kidneys filter it
5. What makes the yellow color in pee?
   • Bilirubin in bile
   • Vitamin K
   • A pigment called urobilin (answer)

Words

• emulsifying: breaking up fat
• villi: tiny gut bumps
• nephrons: tiny kidney filters
• bilirubin: yellow bile pigment
• urobilin: yellow pee pigment