Transcript Digestive_System

By
Maya Cromwell, Robert
Newman, Sean Bradley,
Zahra Syed
chemical
• speeds up rate of chemical reactions
•Ex: pepsin
• Found in stomach
•Ex 2: salivary amylase
•Found in mouth
•
Amazing Fact Time!
Each of your seventy five trillion
cells is incredibly producing two
thousand proteins each second
 Takes
place when food mixes while chewing
and mixed in our stomach.
Chemical digestion
 Breaks
down large molecules of food into
different smaller molecules can absorb
Amazing Facts Time!
We eat about 500 kilograms of food per year
nutrients
enter the bloodstream
and are circulated into the body’s
cells
villi are covered with tiny,
nutrient absorbing cells that pass
nutrients into the bloodstream.
Amazing Facts Time!
It takes your mouth, esophagus, stomach,
small intestine, large intestine, gallbladder,
pancreas and liver just to digest a glass of
milk.
Where it all begins
•Chemical digestion
• salivary amylase (saliva)
•Mechanical digestion
•Teeth
•
Amazing Facts Time!
1.7 liters of saliva is produced each day
by the mouth
 Long
tube connected to stomach
 Peristalsis
 Tube of toothpaste
Amazing Fact Time!
Muscles contract in waves to move the food
down the esophagus. This means that food
would get to a person's stomach, even if they
were standing on their head
 Sac
like digestive organ
 Md
 Churns
food with muscular contractions
 Cd
 Digestive
acids break down the food
 Mucus
Amazing Fact Time!
Within 2-6 hours, all food is
emptied into the small intestine
•Small
intestine is a muscular tube that is about 2.5 cm in
diameter
•If you were to stretch it out, it would be about 6 m
•The villi is located on the inside walls of the small intestine.
•The duodenum is first part of the small intestine
Amazing Fact Time!
The small intestine is 19.7 to 23
feet long
In the duodenum chemical digestion of
 Proteins
 Carbohydrates
 Nucleic acids
 Fat
Amazing Facts Time!
An adult’s stomach can hold
approximately 1.5 liters of
material
 Large
intestine is larger in diameter than the small
intestine
 It is 1.5 m long and 7.5 cm in diameter
 It surrounds the small intestine
Amazing Facts Time!
the large intestine is approximately
5 - 8 feet in length
 In
first part of emulsification, (total destruction),
liver creates bile, then stores it in the gallbladder
 The gallbladder squeezes out the bile into the small
intestine where it breaks down food.
http://www.youtube.com/watch?v=j7GJcKuVGm8&feature=related
Amazing Facts Time!
After you eat, it takes usually
between 24 and 72 hours in
healthy adults for the
complete process of
digestion to occur
The
liver is to the left of the
stomach
It is about the size of a size 3
shoe
Amazing
Facts Time!
The liver performs
over 500 functions
Breaks
down toxins like
bile
Absorbs nutrients like a
sponge with water
Amazing Facts Time!
Your liver can regenerate (re-build) itself. Even if
only 25% of it is still healthy your liver can
regenerate itself into a full liver again
 Is
behind the stomach
 Has enzymes and bicarbonate
Amazing Facts Time!
There are approximately
9,000 taste buds on the
tongue
 Enzymes
break down carbohydrates through
chemical digestion
 Bicarbonate helps neutralize stomach acid
Amazing Facts
Time!
In an average person, it
takes 8 seconds for
food to travel down the
food pipe, 3-5 hours in
small intestine and 3-4
days in the large
intestine
 Stores,
compacts and eliminates indigestible
material from the body
 Enters large intestine as a soupy mixture
 Absorbs most of the water in the mixture and
changes liquid into semisolid waste called
feces or stool
 Whole grain, fruits, and vegetables, contain
a carbohydrate called cellulose (which
humans cannot digest)
 Bacteria help because they feed on cellulose
 The
digestive system completes 2 life
processes:
1. Getting and Using Energy
2. Getting rid of wastes
Amazing Facts Time!
Every day 11.5 liters of digested food,
liquids and digestive juices flow
through the digestive system, but only
100 mls is lost in feces
 Gets
and uses energy by taking in and storing
nutrients
 Gets rid of waste by breaking down food and
getting rid of it through the anus
Amazing Facts Time!
Your liver consists of 96%
water. (The water is inside
the cells and in blood)
 burton.k12.ca.us
 villagemeadows.dvusd.org
 tutorvista.com
Thanks for Watching!!!!!!!!!
Amazing Fact Time!
The surface area of the digestive system is
approximately equal to that of a singles tennis
court