The diagram shows the digestive system of a human. (a) Describe the role of the mouth in digestion. (b) Villi are structures in the small intestine. (i) Which one of the statements about villi is true? A Glucose is the only substance absorbed by villi B Three types of enzyme are absorbed by villi C The capillary network in the villi have a large surface area D The walls of the villi are thicker to absorb more food

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The diagram shows the digestive system of a human - Edexcel - GCSE Biology - Question 4 - 2014 - Paper 1

Question 4

The diagram shows the digestive system of a human. (a) Describe the role of the mouth in digestion. (b) Villi are structures in the small intestine. (i) Which one... show full transcript

Worked Solution & Example Answer:The diagram shows the digestive system of a human - Edexcel - GCSE Biology - Question 4 - 2014 - Paper 1

Step 1

Describe the role of the mouth in digestion.

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Answer

The mouth plays a crucial role in the digestive process by performing mechanical and chemical digestion. Firstly, the teeth chop, cut, and grind food into smaller pieces to increase the surface area, aiding further digestion. Secondly, enzymes in saliva, such as amylase, begin the breakdown of starches into simple sugars. Additionally, saliva moistens and lubricates the food, forming it into a ball known as a bolus for easier swallowing.

Step 2

Which one of the statements about villi is true?

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Answer

C The capillary network in the villi have a large surface area.

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