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

   A bit of Bo's apple peel can't be digested. Which path does it take through the body?

   • Mouth, esophagus, stomach, small and large intestines, out
   • Mouth, esophagus, stomach, large intestine, small intestine, out
   • Mouth, esophagus, stomach, pancreas, then out
   • Mouth, esophagus, stomach, then out through the kidneys
3. 3.

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

   • In the large intestine, with the water
   • In the esophagus, on the way down
   • In the small intestine, with juice from the pancreas
   • In the pancreas, after the beans pass into it
4. 4.

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

   • Carbon dioxide: lungs; urine: large intestine; food leftovers: kidneys
   • Carbon dioxide: stomach; urine: kidneys; food leftovers: liver
   • Carbon dioxide: kidneys; urine: lungs; food leftovers: large intestine
   • Carbon dioxide: lungs; urine: kidneys; food leftovers: large intestine
5. 5.

   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

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.

   Noah compares the two amounts on the kidney card. How much of the filtered fluid becomes urine?

   • No urine: it is made in the large intestine
   • A small part, 1 to 2 of every 150 quarts
   • About half, as the kidneys keep half
   • Each of the 150 quarts, as filtering makes urine
9. 8.

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

   • It takes in nutrients from food in the intestine
   • It removes carbon dioxide from the blood as a gas
   • It stores urine until the bladder is ready
   • It filters blood and returns what the body needs
10. 9.

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

    • Agree: the stomach is too small to finish it
    • Agree: the liver is part of the food tube
    • Disagree: the liver sends bile in through ducts
    • Disagree: it passes through the pancreas instead
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 large intestine finishes it
    • Disagree: the liver finishes it as food passes through
    • Agree: the stomach's acid finishes the job