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Digestive System Components
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Digestive System Components
Follow a meal through the digestive system. Answer each question using your knowledge of organs, enzymes and the conditions they need. Use precise scientific vocabulary.
Follow the food
Track what happens as food travels through the body.
1.Multiple choice: Which sequence shows the route food takes after it is swallowed?
- Oesophagus → stomach → small intestine → large intestine
- Oesophagus → large intestine → stomach → small intestine
- Stomach → oesophagus → small intestine → large intestine
- Oesophagus → stomach → large intestine → small intestine
2.Matching: Match each digestive organ to its main role. Write the correct letter beside each organ.
- A. Liver
- B. Gall bladder
- C. Stomach
- D. Pancreas
- 4. Releases digestive enzymes into the small intestine
- 1. Makes hydrochloric acid and begins protein digestion
- 2. Produces bile
- 3. Stores and releases bile
3.Fill in the blanks: Bile is made in the and stored in the before it enters the small intestine.
4.A meal contains a lot of fat. Explain how bile helps the body digest it, and state whether bile is an enzyme.
Conditions for digestion
Digestive chemicals work best in particular conditions.
5.True or false? Hydrochloric acid in the stomach creates acidic conditions that allow pepsin to work effectively.
TrueFalse
6.A student says, “Stomach acid digests all the food by itself.” Correct this statement by explaining two roles of hydrochloric acid and naming the enzyme that digests protein in the stomach.
7.Explain why bile’s alkaline nature is useful when acidic stomach contents enter the small intestine.
Apply your understanding
Use evidence from the situations to explain what is happening.
8.A lab group shakes oil and water in two test tubes. They add bile salts to tube A but not tube B. Predict what each tube will look like after standing for a short time, and explain how the difference affects fat digestion.
9.A person has a blocked bile duct, so little bile reaches the small intestine. Predict one effect on fat digestion and explain why.
10.Long answer: Describe how the stomach, liver, gall bladder, pancreas and small intestine work together to digest a meal. Include hydrochloric acid, bile and at least one digestive enzyme in your explanation.
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