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Introduction to the Digestive System
The digestive system is essentially a long tube which is about
six meters long and it runs all the way from the mouth right
down to the anus
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You 've got mechanical and chemical
digestion
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after food has entered the mouth it passes into the pharynx,
so the funks is this sort of muscular tube which joins onto
the nasal cavity in the the mouth and it connects them to
the esophagus and the larynx
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behind you 've got this tube which runs down at
the stomach and this is the esphagus so i 've
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Mouth
Food begins its journey through the digestive system in the mouth, also known as the oral cavity
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Teeth chop food into small pieces, which are moistened by saliva before the
tongue and other muscles push the food into the pharynx
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The teeth are 32 small, hard organs found along the anterior and lateral edges of

the mouth
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Teeth are living organs and contain blood
vessels and nerves under the dentin in a soft region known as the pulp
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Tongue
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It is a small organ made up of several pairs of muscles covered in a thin,
bumpy, skin-like layer
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The taste buds on the surface of the tongue
detect taste molecules in food and connect to nerves in the tongue to send taste

information to the brain
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Salivary Glands
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The salivary glands

are accessory organs that produce a watery secretion known as saliva
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The body also uses saliva to
lubricate food as it passes through the mouth, pharynx, and esophagus
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It carries swallowed masses of chewed food along its length
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The function of this sphincter is to close of the end of the esophagus and trap food in the stomach
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the small intestine is highly
convoluted
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So this really really serves to increase the surface area, so it helps
by having a larger surface area
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the small intestine starts at the pylorus of the
stomach, and it ends up there cecum
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So you can see it sort of
relation to the skin
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the function of the large intestine is to
absorb water
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You 've
got the ascending colon, which is this first part on the right which
ascends and then the transverse colon, which descends down into the last part
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the liver receives nutrient rich blood from the gut via a vein called
the portal vein
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it processes the products of digestion

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