Download digestive_system

By,
Jonas Laqua
Please Pay
Attention To
The Dummy
The Mouth's Role in Digestion
The production of saliva is the
first step in digestion and prepares the
body for a meal.
When food is put in the mouth,
the tongue moves it around and the
saliva produced coats and lubricates
the food for easier chewing and
swallowing.
Saliva also contains an enzyme
called amylase that helps to chemically
break down certain carbohydrates in
the meal. Teeth help to mechanically
(physically) break down food into
smaller pieces by tearing and shredding
it. Chewing slowly and well is important
to make sure that the pieces swallowed
are as small as possible to aid further
digestion.
This is a Mouth!
Information from
www.gesa.org.au/digestivesystem/
mouth_throat.cfm
Picture from
wpikcfarzeenw.wikispaces.com/guest
book
THE ESOPHAGUS
The esophagus is the muscular tube
through which food passes on its way
from the mouth to the stomach.
The main function of the esophagus is to
propel food into the stomach.
To ensure that food does not move
backward—a condition known as reflux—
sphincters (constricting ring-shaped
muscles) at either end of the esophagus
close when the food is not passing
through them in a forward direction.
Esophageal function tests are used to
determine whether the sphincters are
working properly. After this, the food
travels down to the…
Information from
Wikipedia.org
What role does the stomach play in digestion?
The stomach's first job is to accept and store the
food that enters it. In response to the arrival of
food, glands present in the lining of the stomach
produce stomach acid (or gastric acid) - another
digestive juice.
Muscles in the wall of the stomach help to move
the food and acid around making sure that they
mix thoroughly. Stomach acid helps to break down
the food further into smaller, easier to digest
fragments. The acid also kills bacteria contained in
the swallowed food or saliva.
By the time food is ready to leave the stomach, it
has been processed into a thick liquid. Finally,
muscular movements in the lower part of the
stomach push this partly-digested food down
towards the…
Information from
http://www.gesa.org.au/digestivesystem/stomach.cfm
Information from
http://www.gesa.org.au/digestivesystem/small_intestine.cfm
The small intestine (also known as the small bowel) is the longest
portion of the digestive tract - it is more than 6 meters long and is
located within the middle of the abdomen. It has three sections, the
duodenum, jejunum and ileum.
Much of the small intestine is coiled and suspended in a thin layer of fat
which gives the intestine a lot of flexibility and mobility.
What does it do?
Digestion of fats, proteins and carbohydrates contained in the foods
you consume, is completed within the small intestine.
The resulting nutrients produced are absorbed through the lining of the
small intestine and transferred to the bloodstream.
Large Intestine
THE LARGE INTESTINE (OR LARGE BOWEL) IS THE PART OF THE
DIGESTIVE SYSTEM WHERE WASTE PRODUCTS FROM THE FOOD YOU
EAT ARE COLLECTED AND PROCESSED INTO FAECES.
THE LARGE INTESTINE IS ABOUT 1.5 M LONG AND CONSISTS OF THE
CAECUM, APPENDIX, COLON AND RECTUM - WHICH ARE
DISTRIBUTED IN THE ABDOMINAL CAVITY.
WHAT DOES IT DO?
THE LARGE INTESTINE PERFORMS THE FOLLOWING FUNCTIONS:
REABSORBS WATER AND MAINTAINS THE FLUID BALANCE OF THE
BODY
ABSORBS CERTAIN VITAMINS
PROCESSES UNDIGESTED MATERIAL (FIBRE)
STORES WASTE BEFORE IT IS ELIMINATED.
Information from
http://www.gesa.org.au/digestive-system/large_intestine.cfm
Crohn’s Disease
Crohn’s disease is an ongoing disorder that causes inflammation of the
digestive tract.
Crohn’s disease can affect any area, from the mouth to the anus, but it
most commonly affects the lower part of the small intestine, called the
ileum.
The swelling extends deep into the lining of the affected organ. The
swelling can cause pain and can make the intestines empty frequently,
resulting in diarrhea.
What are the Symptoms?
The most common symptoms of Crohn’s disease are abdominal pain,
often in the lower right area, and diarrhea. Rectal bleeding, weight loss,
arthritis, skin problems, and fever may also occur. Bleeding may be
serious and persistent, leading to anemia.
Children with Crohn’s disease may suffer delayed development and
stunted growth. The range and severity of symptoms varies.
Several theories exist about what causes
Crohn’s disease, but none have been proven.
The most popular theory is that the body’s
immune system reacts abnormally in people
with Crohn’s disease, mistaking bacteria,
foods, and other substances for being foreign.
The immune system’s response is to attack
these “invaders.” During this process, white
blood cells accumulate in the lining of the
intestines, producing chronic inf lammation,
which leads to ulcerations and bowel injury.
DID YOU KNOW
It takes 12- 72 hours to digest food, depending on the type of
food. It takes about 12 hours to digest vegetables, and about 72
hours to digest red meat, but for normal foods it takes about 24
hours to digest.
It takes 1 hour to digest water or fluid.
If you swallow gum it doesn’t digest, it is just too small of an
amount to digest.
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What is the purpose of the digestive system?
Name the main organs of the digestive system.
What does this Organ do:
Mouth
Esophagus
Stomach
Small intestine
Large intestine
What is Crohn’s Disease?