Identify the organs that supply digestive secretions
Separate the canal from its associated glands and organs.
Section B7.2 · Digestive system
Mapped to the named 0654 section using teaching from the corresponding single-science course. A 0654-specific review of every Core and Supplement objective is still in progress. Written practice is self-checked; it does not demonstrate supervised laboratory competence or award an official Cambridge grade.
Before you begin
- Recall large and small nutrient molecules, cell membranes and enzyme specificity.
- Use the stated diagram keys and evidence; models are not to scale.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
Where is bile made?
What you will learn
- Separate the canal from its associated glands and organs.
- Distinguish production, storage and release of bile.
Secretions join the food route
Salivary glands release saliva into the mouth. The pancreas supplies digestive enzymes to the small intestine. The liver makes bile; the gallbladder stores it and releases it into the duodenum through the bile duct.
Food travels through the canal rather than through each gland. On a diagram, find the organ and its connection to the canal; a short duct can be more informative than the organ’s colour.
Keep making and storing separate
The liver and gallbladder have different bile roles. Saying the gallbladder makes bile confuses storage with production. The pancreas does not store the swallowed meal; it secretes substances that act on the meal in the intestine.
The stomach is a canal organ that also secretes gastric juice. Canal membership and secretion are not mutually exclusive. Identify where a secretion is made and where it acts as separate facts.
Sources for this lesson
Pause and explain
Which statement fits the pancreas?
Worked example
A diagram places a small sac beneath the liver with a duct entering the duodenum. Identify the sac and state its bile role.
Show the worked solution
- Use its position and duct.
- Identify gallbladder.
- Separate storage/release from liver production.
Answer The gallbladder stores and releases bile made by the liver.
Try a topic test
Choose Easy, Normal or Difficult. Save your answers and open worked review after finishing.
Test this topic →From guided practice to a new situation
Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
Name the four associated organs required in this syllabus.
Give me a hint
Include the saliva source.
Compare my reasoning
- Salivary glands.
- Pancreas, liver and gallbladder.
Salivary glands, pancreas, liver and gallbladder.
Look for these in your work
- All four.
- No canal organ substituted.
A table says liver: stores bile; gallbladder: produces bile. Correct it.
Give me a hint
Separate production and storage.
Compare my reasoning
- Liver produces bile.
- Gallbladder stores/releases it.
Liver: bile production; gallbladder: bile storage and release.
Look for these in your work
- Both roles corrected.
- Correct sequence.
An arrow runs from pancreas to duodenum. A learner reads it as food travelling into the pancreas. Explain the alternative shown in a secretion diagram.
Give me a hint
Check arrow key and direction.
Compare my reasoning
- The pancreas secretes digestive juice.
- The duct carries it into the duodenum.
- Food remains in the canal.
The arrow represents pancreatic secretion entering the duodenum, not swallowed food passing through the pancreas.
Look for these in your work
- Use secretion direction.
- Separate the two routes.
Common mistakes
- Bile is made in the liver, not gallbladder.
- Secretion site and action site can differ.
What can you explain now?
Which statement fits the pancreas?
Compare with the explanation
It supplies digestive enzymes to the small intestine.
Its secretions enter through a duct.
After trying it yourself, choose your next review. This is your self-assessment.
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Make it stick
Name each associated organ and the canal region receiving its secretion.
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.