Question 13 of 16intermediate✨ CreateShort Answer5 marks

Using coloured clay, prepare a 3-D model of the digestive system and label all parts of the digestive system using black paper strips.

Correct Answer

A 3-D model of the digestive system should include the following labelled parts:

(1) Mouth – where food enters and mechanical digestion begins with teeth crushing food, and saliva breaks down starch.

(2) Oesophagus (Food pipe) – a long tube that pushes food from mouth to stomach through wave-like contractions.

(3) Stomach – where food is churned and mixed with digestive juices, acid, and mucus; proteins are broken down.

(4) Small Intestine – the longest part (about 6 metres) where most digestion and absorption occurs; receives bile from liver and pancreatic juice from pancreas.

(5) Liver – secretes bile that neutralises acid and breaks down fats.

(6) Pancreas – secretes pancreatic juice that breaks down carbohydrates, proteins, and fats.

(7) Large Intestine – absorbs water and salts from undigested food, making waste semi-solid.

(8) Rectum – stores stool.

(9) Anus – expels waste from the body.

Exercise: Exploratory Projects | Q: P3 | (Page Page 16)
For More Understanding

Explanation

The chapter provides detailed information about the digestive system in section 9.1.1 'Digestion in human beings.' It describes each part of the alimentary canal from mouth to anus, including associated organs like the liver and pancreas. The model should show the complete pathway of food through the digestive system with all major organs clearly labelled.

Solution Steps

  1. A 3-D model of the digestive system should include all major labelled parts from mouth to anus

  2. Mouth – where food enters and mechanical digestion begins with teeth crushing food, and saliva breaks down starch

  3. Oesophagus (Food pipe) – a long tube that pushes food from mouth to stomach through wave-like contractions

  4. Stomach – where food is churned and mixed with digestive juices, acid, and mucus; proteins are broken down

  5. Small Intestine – the longest part (about 6 metres) where most digestion and absorption occurs; receives bile from liver and pancreatic juice from pancreas

  6. Liver – secretes bile that neutralises acid and breaks down fats

  7. Pancreas – secretes pancreatic juice that breaks down carbohydrates, proteins, and fats

  8. Large Intestine – absorbs water and salts from undigested food, making waste semi-solid

  9. Rectum – stores stool

  10. Anus – expels waste from the body

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