Chapter 2: Digestion and Enzymes
In this chapter you will learn:
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Digestion
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The five stages in human eating
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The different areas of the digestive system and what they do
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Enzymes
Digestion
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Digestion is the break down of food
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There are two types of digestion. These are physical and mechanical
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Physical Digestion- Physical digestion involves the breaking down of food with teeth
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Chemical digestion- Chemical digestion involves the use of enzymes to break down food
Stages in human eating and digestion:
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Food taken in through the mouth
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Food is broken down and absorbed into blood
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The blood moves circulates the body and distributes the broken down food
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Food used by cells in the body
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Waste or unwanted material is removed (excreted) from digestive system
The Parts of the digestive system and their function:
Exam Tip: In the exam you will be asked to both label the different parts of the digestive system and state the function of each one
Part: Function:
The Mouth: Physical and chemical digestion
Osephagus: Connects the stomach to the mouth
Stomach: Physical and chemcial digestion
Pancreas: Produces digestive fluids
Liver: Produces bile for digestion of fats
Small intestine: -Absorption of nutrients into the blood
- Chemical digestion
Large Intestine: -Water Absorption
-Elimination of undigested food
Enzyme:
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An enzyme is a biological catalyst meaning it speeds up the process of food digestion without being used up in the process. e.g Amylase