📚 Part 1: Digestive System Knowledge

1. Which organ produces bile to help digest fats?

Pancreas

Liver

Stomach

Small intestine

2. Where does most absorption of nutrients occur?

Stomach

Large intestine

Small intestine

Oesophagus

3. Which enzyme breaks down proteins?

Amylase

Protease

Lipase

Pepsin

4. What is the optimum pH for stomach enzymes?

pH 2 (acidic)

pH 7 (neutral)

pH 8 (alkaline)

pH 10 (very alkaline)

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

Chewing with teeth

Stomach churning

Enzyme breakdown

Acid digestion

✏️ Part 2: Understanding Digestion

6. Complete the sentences about enzymes:

a) Amylase breaks down _____________ into simple sugars.

b) Lipase breaks down _____________ into fatty acids and glycerol.

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

7. Explain why the small intestine has villi. Include the words 'surface area' and 'absorption' in your answer.

8. Describe what happens to a piece of bread as it travels through the digestive system. Mention at least three different organs.

🔬 Part 3: Enzyme Investigation

9. In the starch digestion practical, iodine solution turns blue-black when starch is present. What colour would you expect after 10 minutes if amylase is working effectively?

10. Give two factors that could affect how quickly amylase breaks down starch:

Factor 1: _________________________

Factor 2: _________________________

11. A student notices that their enzyme practical doesn't work at 80°C. Explain why enzymes stop working at very high temperatures.

Human Digestive System

Human Digestive System

📚 Part 1: Digestive System Knowledge

✏️ Part 2: Understanding Digestion

🔬 Part 3: Enzyme Investigation

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