Transcript PowerPoint Presentation - The Human Digestive System

The Digestive System
(Breaking food down into smaller pieces)
Let’s find out what happened to your breakfast today!
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Mouth
Esophagus
Stomach
Small Intestine
Liver
Large Intestine
Gall Bladder
Pancreas
Rectum
Anus
Mouth
• Teeth
(mechanical breakdown)
– Incisors used for cutting
– Canines used for
stabbing and holding
– Molars large surface
area used for grinding
• Saliva
(chemical breakdown)
– Enzyme (speeds up
reactions in the body)
– Breaks down
carbohydrate
Esophagus
• Approximately 25cm
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long
Moves food from the
throat to the stomach
– Muscle movement
called peristalsis
• If acid from the
stomach gets in here
that’s heartburn.
Stomach
• Stores the food you
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eat
Chemically breaks it
down into tiny pieces
Mixes food with
digestive juices
Acid in the stomach
kills bacteria
Small Intestine
• Small intestines are roughly
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6 metres long.
Enzymes and bile are
added.
Villi increase the surface
area to help absorption.
Nutrients from the food
pass into the bloodstream
through the small intestine
walls.
Liver
• Directly affects
digestion by
producing bile
– Bile is an enzyme that
helps dissolve fat
• Processes nutrients in
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the blood, filters out
toxins and waste.
Is often called the
body’s energy factory
Gall Bladder
• Stores bile from the
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liver
Delivers bile when
food is digested
Fatty diets can cause
gallstones
Pancreas
• Produces compounds
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to digest fats and
proteins
Neutralizes acids that
enter small intestine
Regulates blood sugar
by producing insulin
Large Intestine
• About 1.5 metres long
• Accepts what small
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intestines don’t
absorb.
Absorbs water and
minerals from the
waste matter.
Absorption means
taking into the body
via the blood stream.
Rectum and Anus
• Rectum
– About 15cm long
– Stores waste
before egestion.
• Anus
– Muscular ring that
controls egestion.
Write the name of each colored
organ:
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Green:
Red:
Pink:
Brown:
Purple:
Green:
Yellow: