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Chemical and Physical Digestion

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by

Robyn Cline

on 11 June 2010

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Transcript of Chemical and Physical Digestion

Chemical
and
Physical
Digestion Chemical
Digestion Physical
Digestion Chemical digestion occurs when acids, and enzymes break down the food we eat into nutrients. It starts in the mouth and continues in the stomach but most of the process occurs in the small intestine. Physical digestion is the process in which your food is chewed and broken down into smaller pieces increasing the surface area available of the food so the enzymes in chemical digestion can work quicker and speed up digestion The Mouth Physcial Digestion starts by your food being chewed, ground up and then moistened by saliva.The tongue also helps in mashing up the food and creates a bolus which is pushed to the back of your throat into the esophagus.
Chemical Digestion starts once the saliva is released and the enzyme amylase starts to break down the starches into simple sugars. The Esophagus A muscular tube that directs your food from your mouth to your stomach through peristalsis and the pull of gravity. The Stomach The food enters the stomach through the esophageal sphincter where physical digestion is the churning of the stomach walls to mix the food with the enzymes and stomach acid,also breaking it into smaller pieces to create chyme. Once again physical digestion is going to make chemical digestion easier. When churning chemical digestion takes place and the enzyme pepsin turns proteins into polypetides. Hydrochloric acid is also present so pepsin may be activated and it disinfects the food. The Small Intestine This is where most of chemical digestion occurs. Chyme is mixed with other digestive juices such as bile from the liver and pancreatic juice and amylase from the pancreas to break down the chyme so it may continue on digesting. Fats, proteins, starches, and sugars are also broken down by the juices. The Large Intestine The large intestine is responsible for the absorption of water and excretion of solid waste material.
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