What the Body Gives Back: teacher key

Poop and Pee, grade 11 edition, written for 11th grade. Poop and pee are the end of a long accounting process: tubes, filters, bile and bacteria decide what stays, and scientists still test ideas about cubes, whales and cholera.

Read the book. Print this page for the key.

Questions and answers

1. What does peristalsis do?
   • Makes bile
   • Squeezes food and poop along the gut (answer)
   • Filters blood
2. What did the mimic intestine experiment show?
   • Beads alone make cubes
   • Contractions of stiff and soft parts made flat sides and corners (answer)
   • Wombats have a square anus
3. About how much of the fluid the kidneys filter goes back into the blood?
   • Well over 98 percent (answer)
   • About 10 percent
   • About half
4. Why do the kidneys work mostly by sorting what to keep?
   • They store bile
   • They return almost all of the fluid they filter (answer)
   • They make bacteria
5. What does reabsorption describe?
   • Adding wastes to pee
   • Churning food
   • Taking useful things back into the blood (answer)

Words

• peristalsis: gut squeezing waves
• microbiome: gut bacteria community
• reabsorption: taking back in
• glomerulus: kidney filter
• ligands: binding molecules