Digestion and the Human Digestive System - Basic Biology - Lesson 12. (GCSE Science)

This lesson explains everything that you need to know about nutrition in animals and the human digestive system for your GCSE or IGCSE exams.
this lesson explains why nutrition is important and explains what happens to food as it is digested in our bodies. Covering both mechanical and chemical digestion of food, to the absorption of food into our blood and the egestion of waste from our body.

In this lesson you will learn:
• That nutrition is one of the seven life processes
• What nutrition is and why it is important
• What digestion is
• The major organs of the human digestive system and their role in the digestion of food
• The difference between mechanical and chemical digestion of food
• The different enzymes used in the digestion of food
• The role of the mouth in digestion
• The role of the oesophagus in digestion
• How the stomach helps digestion
• What happens in the small and large intestines
• How nutrients are absorbed into our blood
• How villi are adapted to speed up absorption
• What happens to undigested food


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