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Understanding the Physiology of Health and Illness

The digestive system and how food is broken down

  • 3 things to know
  • AS 7

Overview

Two kinds of digestion, three pairs of salivary glands and two functions of the stomach.

What you need to know

Answer each one before you reveal it.

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Key term

What are the two kinds of digestion?

Key term

What does saliva contain, and what does it do?

Key term

Name the three pairs of salivary glands.

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    What are the two kinds of digestion?

    Model answer

    Digestion is mechanical, where food is physically broken into smaller pieces, and chemical, where enzymes break large molecules into small soluble ones.

  2. 2

    What happens to food in the mouth?

    Model answer

    In the mouth the teeth chew food into smaller pieces and the tongue mixes it with saliva to form a bolus that can be swallowed.

  3. 3

    What does saliva contain, and what does it do?

    Model answer

    Saliva contains water, mucus and the enzyme amylase, which lubricates the food and begins the breakdown of starch into maltose.

  4. 4

    Name the three pairs of salivary glands.

    Model answer

    The three pairs of salivary glands are the parotid, the submandibular and the sublingual glands.

  5. 5

    How does food travel down the oesophagus?

    Model answer

    Waves of muscular contraction called peristalsis squeeze food down the oesophagus into the stomach.

  6. 6

    State two functions of the stomach.

    Model answer

    The stomach stores swallowed food and churns it with gastric juice into a semi-liquid called chyme.

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