Q8 of 40 Page 164

The diagram shows the human gut. Which numbered structures secrete digestive enzymes?

Digestive enzymes are secreted by salivary glands (salivary amylase), stomach (pepsin), pancreas (amylase, lipase) and small intestine (trypsin). Liver produces bile juice and it only emulsifies (breaks down) fats and does not digest them.

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5

The diagram represents a section through the small intestine.


What is the role of the structure labelled X?

 6

When a person eats some egg white, proteins and water enter the stomach. Which substances are found leaving the stomach and leaving the small intestine?

 7

In which order do these events occur in human nutrition?

 9

Only two of the following statements accurately describe what happens in the mouth.

1. Amylase breaks down large starch molecules into smaller maltose molecules.


2. Chewing increases the surface area of food for digestion


3. Saliva emulsifies fats into smaller droplets.


4. Teeth breakup large insoluble molecules into smaller soluble molecules.


Which statements are correct?