Digestion and getting rid of waste

Grade 7 Science Worksheet - Challenge Me

Circle the best answer.

1. 1.

   Ari takes a bite of bread, and its starch is broken down into sugar. Which path does the sugar take into the body?

   • Mouth, esophagus, stomach, liver, small intestine
   • Mouth, windpipe, lungs, then the blood
   • Mouth, esophagus, stomach, small intestine, blood
   • Mouth, esophagus, stomach, large intestine, blood
2. 2.

   Esme's beans have protein, which starts breaking down in the stomach. Where is its breakdown finished and absorbed?

   • In the small intestine, with juice from the pancreas
   • In the pancreas, after the beans pass into it
   • In the large intestine, with the water
   • In the esophagus, on the way down
3. 3.

   Jun makes a waste chart for three wastes. Which chart matches each waste with its exit?

   • Carbon dioxide: kidneys; urine: lungs; food leftovers: large intestine
   • Carbon dioxide: stomach; urine: kidneys; food leftovers: liver
   • Carbon dioxide: lungs; urine: large intestine; food leftovers: kidneys
   • Carbon dioxide: lungs; urine: kidneys; food leftovers: large intestine
4. 4.

   During a long run, Kira's muscle cells make more carbon dioxide. Which organs remove it, and how?

   • The large intestine, with the food leftovers
   • The lungs, by breathing it out
   • The kidneys, by putting it in urine
   • The kidneys, by taking it from food in the intestine
5. 5.

   Luz drinks more water than usual at a game. How does the body get rid of the extra water?

   • The lungs turn it into carbon dioxide
   • The kidneys take it straight from the stomach
   • The kidneys filter it from the blood into urine
   • It stays in the blood with no way out

6. Read this first

   NIH NIDDK

   fact	amount
   blood filtered by both kidneys each day	about 150 quarts
   filtered fluid that becomes urine each day	about 1 to 2 quarts
   filtering units (nephrons) in each kidney	about a million

7. 6.

   Milo reads a kidney card. The kidneys filter about 150 quarts a day, yet just 1 to 2 quarts become urine. What happens to the rest of the filtered fluid?

   • It returns to the blood
   • It goes to the large intestine with food waste
   • It is stored in the bladder for days
   • It is breathed out by the lungs
8. 7.

   Pia's kidney card says each kidney has about a million nephrons. What does each nephron do?

   • It removes carbon dioxide from the blood as a gas
   • It filters blood and returns what the body needs
   • It takes in nutrients from food in the intestine
   • It stores urine until the bladder is ready
9. 8.

   Ren says the stomach absorbs most of the nutrients from soup. Agree or disagree?

   • Agree: the soup soaks through the liver first
   • Disagree: most are absorbed in the large intestine
   • Agree: the stomach finishes digestion and absorbs the food
   • Disagree: most are absorbed in the small intestine
10. 9.

    Tala says a sandwich passes through the liver on its way to the intestines. Agree or disagree?

    • Agree: the liver is part of the food tube
    • Disagree: the liver sends bile in through ducts
    • Disagree: it passes through the pancreas instead
    • Agree: the stomach is too small to finish it
11. 10.

    Zee says digestion is finished by the time food leaves the stomach. Agree or disagree?

    • Disagree: the small intestine finishes it
    • Disagree: the liver finishes it as food passes through
    • Disagree: the large intestine finishes it
    • Agree: the stomach's acid finishes the job