Digestion and how nutrients reach the blood

Grade 9 Science Worksheet - Building Confidence

Circle the best answer.

1. 1.

   Ari follows a bite of bread along the tract map. Which organ goes in the blank box?

   • The pancreas, which sends enzymes into the small intestine
   • The liver, which makes bile for fat digestion
   • The stomach, which mixes food with acid and pepsin
   • The rectum, which holds waste until it leaves
2. 2.

   Bo reads the tract map with one helper organ. Which box is a helper that food does not pass through?

   • Box X, the stomach, which holds food and churns it
   • Box Y, the small intestine, which finishes digestion
   • Box W, the esophagus, which pushes food along
   • Box Z, the pancreas, which sends enzymes into box Y
3. 3.

   “Helper map (model, not to scale):” Esme reads the helper map. Which organ makes the bile, and which organ stores it?

   • The liver makes it, and the pancreas stores it
   • The liver makes it, and the gallbladder stores it
   • The gallbladder makes it, and the liver stores it
   • The pancreas makes it, and the gallbladder stores it
4. 4.

   Saliva has an enzyme, amylase, that starts changing the starch in bread into sugar. Kira asks what kind of digestion that is.

   • Absorption, because the starch moves into the blood
   • Mechanical digestion, because it happens in the mouth
   • Chemical digestion, because an enzyme changes the starch
   • Not digestion, because chewing is the whole of digestion in the mouth
5. 5.

   In the stomach, muscles churn a mouthful of beans while acid and pepsin act on it. Luz asks which part is mechanical digestion.

   • The churning, which mixes and breaks up the food
   • The pepsin, which breaks protein into smaller peptides
   • The acid, which helps pepsin start working
   • No part, because the stomach holds food until it moves on
6. 6.

   Noah eats a bowl of beans. Pepsin in the stomach starts breaking down one nutrient in them. Which nutrient is it?

   • Fat, which pepsin breaks into fatty acids
   • Protein, which pepsin breaks into smaller peptides
   • Starch, since pepsin and amylase break down the same food
   • Sugar, which pepsin breaks into smaller sugars
7. 7.

   Pia eats a handful of nuts. Lipase, with help from bile, works on the oil in them. What does lipase make?

   • Sugars, which are small enough to absorb
   • Fatty acids and monoglycerides, which are small enough to absorb
   • Amino acids, which are small enough to absorb
   • Bile, which is stored in the gallbladder

8. Read this first

   Map (model, not to scale)

   One arrow runs from the digested sugars in the small intestine to a box marked ?. Other boxes on the map are the lacteal, the stomach lining and the large intestine.

9. 8.

   Ren reads the map. After an apple is digested, where do its sugars go first when they are absorbed?

   • Into the blood capillaries of the villi
   • Into the stomach lining, where most absorption happens
   • Into the lacteals of the villi
   • On to the large intestine, where most absorption happens

10. Use this

    Map (model, not to scale):

11. 9.

    Tala reads the map. What does the arrow from the large intestine to the circulatory system carry?

    • Most of the sugars and amino acids from the meal
    • Pepsin, to finish digesting the protein
    • Bile, to finish digesting the fats
    • Water, taken back from the leftover material
12. 10.

    Zee reads the map of where a meal's nutrients enter the blood. Which organ goes in the box marked ?

    • The large intestine, which receives the leftovers
    • The small intestine, which has villi
    • The stomach, which churns food and starts protein digestion
    • The esophagus, which carries food to the stomach