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, esophagus, stomach, small intestine, blood
   • Mouth, esophagus, stomach, large intestine, blood
   • Mouth, windpipe, lungs, then the 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, pancreas, then out
   • Mouth, esophagus, stomach, then out through the kidneys
   • Mouth, esophagus, stomach, large intestine, small intestine, out
3. 3.

   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 kidneys, by taking it from food in the intestine
   • The lungs, by breathing it out
   • The kidneys, by putting it in urine
4. 4.

   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
   • It stays in the blood with no way out
   • The kidneys filter it from the blood into urine

5. 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

6. 5.

   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 is stored in the bladder for days
   • It goes to the large intestine with food waste
   • It returns to the blood
   • It is breathed out by the lungs
7. 6.

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

   • About half, as the kidneys keep half
   • Each of the 150 quarts, as filtering makes urine
   • A small part, 1 to 2 of every 150 quarts
   • No urine: it is made in the large intestine
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 stores urine until the bladder is ready
   • It filters blood and returns what the body needs
   • It takes in nutrients from food in the intestine
9. 8.

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

   • Disagree: most are absorbed in the small intestine
   • Agree: the stomach finishes digestion and absorbs the food
   • Disagree: most are absorbed in the large intestine
   • Agree: the soup soaks through the liver first
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
    • Disagree: the liver sends bile in through ducts
    • Disagree: it passes through the pancreas instead
    • Agree: the liver is part of the food tube
11. 10.

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

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