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Complete the sentence by putting a cross (X) in the box next to your answer - Edexcel - GCSE Biology - Question 5 - 2013 - Paper 1
Question 5
Complete the sentence by putting a cross (X) in the box next to your answer. Food is moved through the digestive system by A diffusion B digestion C peristal... show full transcript
Worked Solution & Example Answer:Complete the sentence by putting a cross (X) in the box next to your answer - Edexcel - GCSE Biology - Question 5 - 2013 - Paper 1
Step 1
Step 2
State two roles of bile in digestion.
Answer
- Bile neutralizes stomach acid, raising the pH level of the intestinal contents, which allows digestive enzymes to function effectively.
- Bile emulsifies fats, breaking them down into smaller droplets to increase the surface area for fat digestion by enzymes.
Step 3
Describe the roles of the enzymes involved in digestion.
Answer
Digestive enzymes play crucial roles throughout the digestive system:
- Amylase breaks down carbohydrates into simple sugars, which can be easily absorbed by the body.
- Proteases break down proteins into amino acids, which are essential for various bodily functions.
- Lipases are responsible for breaking down fats into fatty acids and glycerol, aiding in fat digestion.
These enzymes work at different pH levels and locations in the digestive tract, ensuring efficient digestion and nutrient absorption.