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Animal system and digestive system - Coggle Diagram
Animal system and digestive system
Digestive system
All living things need food to survive because food is important for providing energy and maintaining a healthy body
The food that we eat cannot be absorbed into our body because they are not simple substances. In order for the food to be absorbed into our body, it is needed to be changed into simpler substances
The process of breaking down food into simpler substances is called digestion
The function of the digestive system is to break down food into simple substances so that they can be absorbed into our bodies.
Food is broken down by three different organs in the human digestive system
Parts of a digestive system
Mouth
Saliva helps moisten and soften the food so that can be swallowed easily
Food chewed into smaller pieces to increase the surface area of food and digestive juices
Saliva contains digestive juices. Tongue mixes digestive juices in saliva with food
Small intestine
More digested juices are released so that food can be fully digested to simple substances
Simpler substances become nutrients in our body
Blood in circulatory system helps transport these nutrients to all parts of body
Stomach
Digestive juices is also released into the stomach
Stomach churns and mixes food with digestive juice
Partially digested food becomes watery
Large intestine
Water and mineral salts from undigested food are absorbed into the body
Gullet
Tube where partially digested food from mouth moves along it to the stomach
No digestion takes place here
Anus
Where solid waste is removed from body
How the size of food affects the speed of digestion
The size of food affects how fast the food is digested
This is because the size of food affects the amount of its exposed surface are to the digestive juices