Digestive System 

Digestion:- A process by which food is broken down into simple chemical substance that can absorible an use as nutrients.

Digestive system :- A set of biological organ that involve in the process of digestion is called digestive. 

Type of digestive organ

Primary digestive organ
Asecsser digestive organ 

Primary digestive organ:- The organ that are directly involve in the process  of digestion is called primary digestive organ. Ex mouth, pharynx, oesophagus, stomach, small intestine, large intestine, rectum and  anus. 

Asecsser digestive organ:- The organ those are assit in the process of digestion. Ex Teeth, tounge, sliviri gland, pancrieas, liver and gall bladder. 

Digestion: The process of breakdown of complex food items into simpler forms for them to be absorbed by the body is known as digestion.  

Steps of digestion of food in humans: 

1. It begins with the ingestion of food via the buccal cavity where the food is chewed and saliva gets mixed with it forming a bolus. 

2. The saliva having the salivary amylase acts upon the starch and forms maltose and dextrin. 

3. The bolus thereafter passes through the oesophagus by peristalsis and reaches the stomach. 

4. The stomach releases HCl which activates the pepsin enzyme in the stomach and breaks down the proteins. 

5. Here, the food is mixed with water within the stomach, and chyme is formed. 

6. The chyme travels to the small intestine for the final stage of digestion. 

7. Thereafter within the small intestine, the enzymes from the liver and pancreas are secreted which break down the fats and proteins further. 

8. After the complete breakdown of the food, it is absorbed into the blood vessels with the help of the villi in the small intestine. 

9. Post absorption is the process of assimilation that begins by which the digested food is transported to every tissue of the body for the cells to convert all that food into energy.

Process of digestion 

Ingestion  ( entry of food) 

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Propulsion ( move down of food)

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Digestion ( Break down of food) 

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Absorption 

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Elimination