🧬 Part 1: Digestive System Structure

1. Label the following organs on the digestive system diagram (your teacher will provide):

Word bank: mouth, oesophagus, stomach, small intestine, large intestine, liver, pancreas, gall bladder

2. Which organ is primarily responsible for absorption of nutrients into the bloodstream?

Stomach

Small intestine

Large intestine

Liver

3. Match the enzyme to the nutrient it breaks down:

Amylase

Protease

Lipase

Proteins

Carbohydrates

Lipids (fats)

4. Which of the following are examples of mechanical digestion? (Tick all that apply)

Chewing with teeth

Stomach churning

Enzyme breakdown

Acid production

🔬 Part 2: Enzymes and Digestion

5. Complete the sentences about enzyme conditions:

a) Enzymes work best at their _____________ temperature and pH.

b) The stomach has a _____________ pH, whilst the small intestine has an _____________ pH.

c) If temperature is too high, enzymes become _____________.

6. In the starch digestion practical, iodine solution changes from blue/black to colourless. Explain what this tells us about enzyme activity:

7. Why is it important that the small intestine has villi?

To produce more acid

To increase surface area for absorption

To store bile

To break down proteins

💡 Part 3: Application and Analysis

8. A person has damage to their pancreas. Explain how this might affect their digestion:

9. Describe the journey of a piece of bread through the digestive system, mentioning at least 4 organs and what happens at each:

10. True or False: Chemical digestion only occurs in the stomach.

True

False

Explain your answer: _________________________________

Human Digestive System Worksheet

Human Digestive System Worksheet

🧬 Part 1: Digestive System Structure

🔬 Part 2: Enzymes and Digestion

💡 Part 3: Application and Analysis

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