Download The Digestive System

The Digestive System
By: Prescott Jackson
Per: 7
Overview
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The digestive system breaks down
food, extracts energy and throws out
the remaining waste
Overview (cont.)
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The food is:
Chewed and salivated
Pulled down the throat
Broken down in stomach
Absorbed in small intestine
Absorbed in large intestine
Expelled from the body through the anus
Scene Selection:
Mouth
Start
Esophagus
Stomach
Liver &
Pancreas
Small
Intestine
Large
Intestine
Rectum
& Anus
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Mouth
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Teeth physically rip and grind food into smaller chunks
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Salivary glands excrete saliva
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Saliva contains both enzymes which chemically break down food, and mucin, a
lubricant that helps food down (http://www.uni-hamburg.de/biologie/index.html)
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The broken down food, now called a bolus, falls into the pharynx
(Salivary Glands)
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Throat (Esophagus)
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The pharynx is the space between the oral cavity and the esophagus
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Muscles move flaps of skin (the soft palate and the epiglottis) to block your
windpipe and nasal cavity
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The bolus falls into the esophagus
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Smooth muscles progressively contract and expand to squeeze the food down the
esophagus, where it falls into the stomach (this motion is called peristalsis)
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Stomach
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Stomach acids continue chemical digestion
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Muscles move the stomach wall to churn the food into a thin liquid
called chyme
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The chyme is then pushed out of the stomach through the pylorus
and into the duodenum
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Liver & Pancreas
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Bile from the liver and more enzymes from the pancreas
empty into the duodenum
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These help with digestion
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The chyme now passes into the small intestine
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Small Intestine
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The small intestine has three sections to it: the duodenum, the jejunum, and the
ileum
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As the food passes through the jejunum, nutrients are absorbed through villus,
which line the small intestine
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What is left of the chyme passes through the ileum and into the large intestine
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Large Intestine
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The chyme that has not been absorbed already enters the large intestine
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As it passes through the many parts of the large intestine, remaining nutrients,
as well as the water and salt in your food is absorbed
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(the parts of the large intestine are: cecum, ascending colon, transverse colon,
descending colon, and sigmoid colon)
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The remaining substance is feces
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Rectum & Anus
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The feces enters the rectum where it is stored
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When enough feces are in the rectum, muscles push the feces through the anus
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The feces fall out of the anus, which brings us to…
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The End
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Quiz!!!!!!!
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After being broken down by saliva, the food substance is called: (slide 5)
Chyme
Bolus
Feces
Bile is excreted from the liver: (slide 8)
Enzymes
Acid
Chyme
Correct
as is
The Motion that squeezes the bolus down the esophagus is called: (slide 6)
Smooth
Muscle
mechanics
Peristalsis
Psyokinetics
Magic
The tentacle structures that absorb food in the small intestine: (slide 9)
villus
sillia
Hot dogs
(Um, no)
scphincters
The middle part of the small intestine: (slide 9)
ileum
jejunum
duodenum
cecum
This Presentation was:
Unspeakably
Horrible
Freakin
AWESOME!
Feces
Worthy of
Slide 11
“You’re
kilin’
me”
-Mr Theil
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Title
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Selection
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Afterward
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Yes, the toilet is linked
No, there is not really an animation on slide 11
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Here are the two animations I used in their entirety, as well as their links
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