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The Digestive System;

an 8th Grade Science Project by Bahia Chaikho.

bahia chaikho

on 14 April 2013

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Transcript of The Digestive System;

THE DIGESTIVE SYSTEM The ingesting, digesting,
absorbing, and eliminating
of food to store nutrients
our cells feed on. Food The Digestive System Mouth First step of ingestion. Breaks down food with
teeth, and saliva from salivary glands, which contains
amalyse, an enzyme. One Big Tube Salivary Glands Epiglottis Covers entrance to trachea to close the
trachea, so food doesn't enter. Esophagus After the bolus reaches the
pharynx, it travels down the
esophagus. The esophagus
is a tube that connects the
pharynx to the stomach. It
pushes the bolus through the
esophagus in a process called
peristalsis. Your esophgus is
much like a vacuum hose. Sphincter A sphinter controls
food entry from the
esophagus. Stomach The stomach is like a
bag lined with mucus.
It does the majority of
the digesting of the
bolus. DIGESTION INGESTION Pancreas The pancreas produces
insulin, which breaks down
the bolus even further. Pancreatic Duct Duodenum Liver The liver produces bile,
stored in the gall bladder.
Bile breaks down blobs of
fat. Gall Bladder The gall bladder stores
bile. Gastric Acid Gastric acid is in insulin.
It is highly acidic, so our
stomachs are lined with
mucus for protection. Bolus Sphincter Small Intestine The small intestine is where
most of the absorbtion takes place.
The first half of the small intestine is
called the duodenum. Chyme ABSORBTION Villi Villi increase the
surface area of the
small intestine in
order to absorb more
nutrients. Circulatory System!! Large Intestine The large intestine takes undigested
material and absorbs the water left in
it. Excretory System!! Rectum Anus
Full transcript