The Digestive System By: Prescott Jackson Per: 7.
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Transcript of The Digestive System By: Prescott Jackson Per: 7.
The Digestive System
By: Prescott Jackson
Per: 7
Overview
The digestive system breaks down food, extracts energy and throws out the remaining waste
Overview (cont.)
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
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Scene Selection:Mouth
Esophagus
Stomach
Liver & Pancreas
SmallIntestine
LargeIntestine
Rectum& Anus
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Quiz
Mouth Teeth physically rip and grind food into smaller chunks
Salivary glands excrete saliva
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)
The broken down food, now called a bolus, falls into the pharynx
(Salivary Glands)
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Throat (Esophagus) The pharynx is the space between the oral cavity and the esophagus
Muscles move flaps of skin (the soft palate and the epiglottis) to block your windpipe and nasal cavity
The bolus falls into the esophagus
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 Stomach acids continue chemical digestion
Muscles move the stomach wall to churn the food into a thin liquid called chyme
The chyme is then pushed out of the stomach through the pylorus and into the duodenum
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Liver & Pancreas
Bile from the liver and more enzymes from the pancreas empty into the duodenum
These help with digestion
The chyme now passes into the small intestine
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Small Intestine
The small intestine has three sections to it: the duodenum, the jejunum, and the ileum
As the food passes through the jejunum, nutrients are absorbed through villus, which line the small intestine
What is left of the chyme passes through the ileum and into the large intestine
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Large Intestine The chyme that has not been absorbed already enters the large intestine
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
(the parts of the large intestine are: cecum, ascending colon, transverse colon, descending colon, and sigmoid colon)
The remaining substance is feces
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Rectum & Anus
The feces enters the rectum where it is stored
When enough feces are in the rectum, muscles push the feces through the anus
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
Correctas is
The Motion that squeezes the bolus down the esophagus is called: (slide 6)
Peristalsis
SmoothMuscle
mechanics
Magic
Psyokinetics
The tentacle structures that absorb food in the small intestine: (slide 9)
villus
sillia
Hot dogs
scphincters
(Um, no)
The middle part of the small intestine: (slide 9)
ileum
jejunum
duodenum
cecum
This Presentation was:
UnspeakablyHorrible
Feces
Worthy ofSlide 11
“You’rekilin’me”
-Mr Theil
FreakinAWESOME!
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Afterward
Yes, the toilet is linked No, there is not really an animation on slide 11
Here are the two animations I used in their entirety, as well as their links
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