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Human Nutrition and Health

Minerals, water and dietary fibre

  • 3 things to know
  • A2 7

Overview

Three functions of calcium in the body, four dietary sources of calcium and function of fluorine in the diet.

What you need to know

Answer each one before you reveal it.

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Key term

Name three sources of fluoride.

Key term

State three functions of calcium in the body.

Key term

Name four dietary sources of calcium.

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    State three functions of calcium in the body.

    Model answer

    Calcium gives strength to bones and teeth, is needed for muscle contraction and nerve transmission, and takes part in the clotting of blood.

  2. 2

    Name four dietary sources of calcium.

    Model answer

    Milk, cheese and yoghurt, tinned fish eaten with the bones, dark green leafy vegetables and calcium-fortified plant milks all supply calcium.

  3. 3

    Which vitamin must be present for calcium to be absorbed properly?

    Model answer

    Vitamin D must be present for calcium to be absorbed properly from the gut.

  4. 4

    What is osteoporosis, and which dietary factors are linked to it?

    Model answer

    Osteoporosis is a condition in which bone density falls and bones fracture easily, and low lifelong calcium and vitamin D intake, low body weight and heavy alcohol use are among the factors linked to it.

  5. 5

    State the function of fluorine in the diet.

    Model answer

    Fluorine, supplied in the diet as fluoride, is incorporated into tooth enamel and makes it more resistant to the acid attack that causes decay.

  6. 6

    Name three sources of fluoride.

    Model answer

    Drinking water in areas where supplies are fluoridated, tea, and fish eaten with the bones supply fluoride, and fluoride toothpaste supplies it to the tooth surface directly.

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