The Body's Two Exits: teacher key

Poop and Pee, grade 7 edition, written for 7th grade. Poop and pee are what is left when your body takes what it needs. Follow food through the stomach and intestines, follow blood through the kidney filters, and see how the muscles at each exit work.

Read the book. Print this page for the key.

Questions and answers

1. Where does the cube shape of wombat poop form?
   • At the anus
   • Inside the intestine (answer)
   • In the stomach
2. What do villi do?
   • Make bile
   • Close the anus
   • Give the small intestine a huge surface for taking in nutrients (answer)
3. What does the kidney filter keep in the blood?
   • Water and small wastes
   • Blood cells and large proteins (answer)
   • Only salt
4. Why does the stomach pass food on only a little at a time?
   • You can eat much faster than the small intestine can digest and absorb (answer)
   • The liver has no room
   • The bladder is full
5. Which muscles let you choose when to open the anus?
   • Ureters
   • Villi
   • Anal sphincters (answer)

Words

• villi: tiny gut bumps
• bile: liver fluid
• bilirubin: yellow bile pigment
• ureters: kidney-bladder tubes
• sphincters: ring-shaped muscles