The hardest substance in the human body is
Correct answer: C. enamel
- A. dentine
- B. bone
- C. enamel
- D. cement
Explanation
Enamel caps the crown of the tooth with a layer of mineral crystals harder even than bone, enabling it to withstand years of grinding. Once lost it cannot regenerate, which is why decay is permanent.
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About Human Digestive System
The human digestive system breaks food into absorbable molecules through mechanical processing, enzyme action and chemical conditions along the alimentary canal. Questions cover the mouth, stomach, small and large intestines, liver, pancreas and associated secretions, including the digestion and absorption of carbohydrates, proteins, lipids, vitamins, minerals and water.
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