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Macrominerals: exploring the role of inorganic macronutrients

Explore the physiological functions of calcium, phosphate, sulphur, sodium, potassium and chloride, and the effects of deficiency and excess.

Vitamins E and K: their role and the effects of deficiency

Read our guide to essential vitamins E and K, how they work and why the body needs them.

Vitamin D: the 'sunshine vitamin', its role and the effects of deficiency

Vitamins A and C: their function and structure explained

Understand the structure of vitamins A and C, essential functions in the body and signs and symptoms of vitamin deficiency.

The senses 4: touch – physiology of the sensation and perception of touch

Abstract This final article in our series on the human senses explores the physiology of the sense of touch, including the receptors and sensory neurons