the digestion sim powerpoint

8/22/2019 The Digestion SIM Powerpoint

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The food process starts as soon as

the food enters the mouth. Thefood is cut into small pieces by the

teeth. This is called ingestion.In themouth, the salivary glands secreteenzymes called ptyalin. It breaksdown starch into maltose.


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The food is pushed to the back of the

mouth by the tongue, passes through

the pharynx and goes to theesophagus, a long tube that connectsthe mouth to the stomach. The

rhythmic muscular action called

peristalsis pushes the food down tothe stomach.


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The stomach is a pear-shaped organ for abouthours. There are three kinds of cells in the stomach

that secrete the mucus, enzymes, hydrochloric acid

and water which combine to form gastric juice. The

enzymes produced by the stomach are mostly

Proteases which break down proteins. The principalprotease is called pepsin which breaks downprotein into polypeptides. The food is churn forseveral hours in the stomach.


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After the food has been digested in the stomach,

it goes down into the small intestine. This iswhere most of the chemical digestion andabsorption of food molecules occur. It containsenzymes produced by the liver, pancreas, and theintestinal glands. The pancreas producespancreatic juice that acts on carbohydrates, fatsand proteins in food. The liver produces bile thathelps in the digestion of fats and lipids.


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Inside the small intestine are lined

fingerlike projection called villiwhich absorbs the food molecules,

and conduct them through the

blood stream. The blood carries the

food to the different cells of the

body.


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The food that was not fully

digested goes to the bigger colon

or large intestine which absorbswater from the lumen. The solidindigestible wastes called fecesremain.


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The last portion of the

alimentary canal about 20-30

centimeters is the rectum. Fecesremained there until they areeliminated from the body

through the opening called

anus. This is now calledexcretion.


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REMEMBER THAT:

The digestionis the process of changing food into tiny pieces(mechanically and chemically) that can be absorbed into the bodyand used by the cells.

The digestive system is composed of the mouth, esophagus,stomach, small and large intestine, pancreas and liver, and rectumor anus.


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S A L I V A R Y A M Y L A S E

L N C O L R J D A N I E L A T

B U X L E E P K A T H R Y N A

C S I S J D D P R O T E I N R

P A T U A D I E E E I S S A D

A A N K H A G S T N C A Y P Y

F U S R K L E O C D D T N O H

M B A I O B S P N E M I U K O

A U J S T L T A I S A L X M B

B O L U S L I G H J P E H C R

K A T H A A O U P K A U B V A

P A D I L G N S S L J M N S C


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Foodenters the

mouth-------- Esophagus

-------- SmallIntestine

-------

---------Food

becomesFeces

---------

Eliminated

by Anus

Outside

World!


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Foodenters the

mouthMouth Esophagus

Stomach SmallIntestine

Pancreasand Liver

LargeIntestine

Foodbecomes

Feces

Fecesremained in

Rectum

Eliminated

by Anus

Outside

World!


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Leah Rose ParasTrisha Kate NaganoIssabette PajarillagaKeren Claire Paras


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the digestion sim powerpoint

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