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The Digestive System - Coggle Diagram
The Digestive System
The Process
- Saliva in the mouth starts by breaking down the carbohydrates like starch
- The part-digested ball of food is swallowed and squeezed down to the stomach
- In the stomach, the food is mixed with digestive juices containing enzymes and hydrochloric acid which are secreted from the glands in the stomach wall
- Them digestive juices begin to break down the proteins, sugars and fats
- The part digested food is squeezed into the small intestine through the duodenum
- Digestive juices from the pancreas continue the breakdown of starches
- Bile from the liver emulsifies the fats. Inside the small intestine, villi increase the surface area and therefore aid absorption of small molecules into the bloodstream
- By the time the mixture leaves the small intestine, almost all the digested food will have been absorbed through its walls
- The rest of it travels very slowly through the colon, which is where the last stages of absorption take place
- What is left is largely fibre mixed with bacteria in the colon and this is left through the anus
Organisation
smallest - cell, tissue, organ, organ system, organism - largest
cell - the smallest unit of an organism e.g. nerve cell, root hair cell
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organ system - a group of organs working together to perform a specific function e.g. digestive system
organism - a group of organ systems working together e.g. human, frog
Digestion is the process by which food is broken down into smaller substances in order to to be absorbed into the bloodstream and distributed around the body
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