The Digestive System and Testing Food for Nutrients · seed 1 · A4, ink-friendly. The answer key prints on its own page for grown-ups.

Following food through the gut

Science · Organisms & Life Processes · ages 14-15
Name ______________________   Date ____________

  1. Which enzyme starts on starch in the mouth?

    • Pepsin
    • Salivary amylase
    • Pancreatic lipase

  2. Where does most chemical digestion finish and absorption happen?

    • Small intestine
    • Esophagus
    • Large intestine

  3. What does bile do in the small intestine?

    • Snips protein into amino acids
    • Absorbs water into the blood
    • Breaks large fat globules into tiny droplets

  4. A student calls bile an enzyme because it helps with fat. What is wrong?

    • Bile never snips molecules, so it is no enzyme
    • Bile works in the stomach
    • Bile is made by the pancreas

  5. Follow a bite of bread: mouth, esophagus, stomach, then where for the main work?

    • Back to the mouth
    • The small intestine
    • Straight to the blood

  6. A fat test on soup changes, while the water control stays the same. What is the result?

    • The test failed completely
    • Water contains fat
    • Fat is present in the soup

  7. A starch test looks exactly like the water control. The food therefore contains starch.

    Circle one:   True   False

  8. One patient lacks stomach acid, another lacks bile. Whose fat digestion suffers most?

    • Both equally, since both juices digest starch
    • The one lacking stomach acid
    • The one lacking bile
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Answer key

For grown-ups. Fold this page away before handing over the rest.

Following food through the gut W1-mt__mBJCQEqPS-s1

  1. Salivary amylase · Salivary amylase begins starch digestion in the mouth.
  2. Small intestine · The small intestine finishes digestion and passes nutrients into the blood.
  3. Breaks large fat globules into tiny droplets · Bile splits fat into tiny droplets so enzymes gain more surface.
  4. Bile never snips molecules, so it is no enzyme · Enzymes snip molecules apart, while bile only splits fat droplets.
  5. The small intestine · After the stomach, the small intestine finishes digestion and absorbs nutrients.
  6. Fat is present in the soup · Change against an unchanged control means the nutrient is present.
  7. False · Matching the control is a negative result, so the nutrient is absent.
  8. The one lacking bile · Without bile, fat stays in large globules that enzymes can barely reach.
Worksheet · LightMySky