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ICSE Class 9 Answered

digestive system explain 
Asked by rahul23.rk40 | 28 Dec, 2018, 10:44: PM
answered-by-expert Expert Answer
Ingestion refers to the entry of food into the alimentary canal through the mouth. There, the food is chewed and mixed with saliva, which contains enzymes that begin breaking down the carbohydrates in the food 
 
Food leaves the mouth when the tongue and pharyngeal muscles propel it into the esophagus. This act of swallowing, the last voluntary act until defecation, is an example of propulsion, which refers to the movement of food through the digestive tract.
 
Digestion includes both mechanical and chemical processes. Mechanical digestion is a purely physical process that does not change the chemical nature of the food. Instead, it makes the food smaller to increase both surface area and mobility. In chemical digestion, starting in the mouth, digestive secretions break down complex food molecules into their chemical building blocks (for example, proteins into separate amino acids). The process is completed in the small intestine.
 
In defecation, the final step in digestion, undigested materials are removed from the body as feces.
Answered by Sivanand Patnaik | 10 Jan, 2019, 09:34: AM

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