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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