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Digestive System

Biology Project on Digestive System.
by

devin lewellen

on 4 May 2010

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Transcript of Digestive System

Liver
Bile
Homeostasis



Stomach
mucus lining
gastric enzymes-hydrochloric acid & pepsin

duodenum jejenum ileum Common
Bile
Duct Gallbladder
ascending colon:
Transverse Colon:
absorbs fluids & salts Descending Colon:
holds the resulting waste Sigmoid Colon Rectum anus



Small Intestine





Cellular Debris Bacteria Indigestible Food Residue Fats Minerals Water The primary function of the digestive system is to
break down and digest foods and nutrients such
as carbohydrates, vitamins, proteins, fats, and
minerals into a form that cells can use for energy,
repair, and reproduction because cells can't use
them in the form they are in as food.

Ingestion Digestion Absorption Egestion















Four Stages:













Interactions With Other Systems Immune System lysosome enzyme &
lacteals

Nervous System psychic secretion &
saliva

Circulatory System villi & absorption

Muscular System peristalsis &
muscle layers

Mouth
mechanical
chemical
-ptyalin
-amylase



esophagus


Esophagus
peristalsis
esophageal sphincter Stomach
fundus pylorus pyloric sphincter
muscles-3 layers
very acidic
mechanical
-cookie dough
chemical
-gastric juices/enzymes Small Intestine Digestion Pancreatic Juices Liver Small Intestine carbohydrates,
lipids, nucleic acid,
starch, fat, protein
amylase
trypsin
lipase sodium bicarbonate fats bile Proteins, starch maltase, sucrase,
lactase
peptidase Chyme mixes with the digestive enzymes
from the pancreas, liver, and small
intestine in the duodenum. Pancreas The Digestive
System!


...om nom nom... Myra Khan
Devin Lewellen Taking Care of Your Digestive System...

watch what you eat!
eat fibers-fruits & vegetables
not so much sugar!
avoid spicy & fatty foods--they prevent you
from getting the essential nutrients
follow the food pyramid! not the cookie
monster!
brush your teeth!




Disorders! :O Peptic Ulcer Diarrhea Constipation Appendicitis Diseases! :O Gastroesophageal Reflux Disease (GERD) Ulcerative Colitis Colon Cancer Esophageal Sphincter isn't working properly....

Treatment: Change your diet or medication

Prevention: Eat Healthy! Polyps!

Symptoms:
abdominal pain
gastrointestinal bleeding
weight loss
constipation
Treatment:
surgery
-remove polyps
-remove colon
chemotherapy
Prevention:
screen, screen, screen!
-annual rectal exam-40
-blood & stool testing-50 Ulcers are ptoduced in the colon's mucus
lining.
Usually mild symptoms, but in severe cases there may be:
nausea
fever
bloody diarrhea
extreme abdominal pain
possibility of hemorrhaging
risk of getting colon cancer
Treatment:
dietary changes (no raw fruits and vegetables)
corticosteroids/other anti-inflammatory drugs
proctocolectomy & ileostomy
Gingivitis Careers

Chef
-Salary:
Cooking Assistant $22,233 - 28,695
Executive Chef $57,471 - 87,563
Executive Pastry Chef $47,756 - 71,559
Food Scientist $49,862 - 75,800
Hotel Manager $68,000 - 124,756
Line Cook $20,169 - 26,396
Restaurant Manager $38,533 - 56,491
Sous Chef $33,912 - 53,123
-Education/Training
Masters Degree-1-2 years
Bachelor's Degree-4 years
Associates Degree- 2 years
*Education and Experience plays a big role
in the salary

Careers

Water/Wastewater Engineer
-salary depends on education
-less than 1 year- $30,000-$54,000
-1-4 years-$48,000-$60,000
-5-9 years-$57,000-$73,000
-10-19 years-$64,000-$98,000 Careers

Gastroentologist
-Education
-complete medical school
-3 year Internal Medicine residency
-specialized training-2-3 years
-Salary-$389,385
Current Research/Technology

Research is being done on 3 main topics:
-certain nerves and their control over the stomach
the intestines
-genes and mutations in reaction to medication that
affects the nerves that control the digestive system
-what causes our stomachs to know that the body is
full
another research topic is changing bacteria in the
digestive system as a treatment for obesity Fun Facts! :D Food stays in the stomach for about 4-6 hours, and
in the small intestine for 4-8 hours
The liver is the largest organ in the body
The stomach can hold about a gallon of food
Villi in the small intestine increase the absorbing surface
area by about 600 folds--equivalent to half of a
basketball court
The appendix doesn't do anything. Biologists believe it's
left over from another time in evolutionary history.
The small intestine is about 20 feet long--about 3 times
the size of the large intestine Homeostasis

gastrin hormone
liver
pancreas
Full transcript