Science Proyect
Published on Nov 18, 2015
Science proyect
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PRESENTATION OUTLINE
DIGESTIVE SYSTEM
F.DIEGO, A.GALAZ, MR.HERNANDEZ, MB.REINA, X.OLGUIN, F.CHARLES
Photo by scorpiorules58
DIGESTIVE SYSTEM:
It takes in materials needed by the body and breaks them down in a form that body cells can
use.
Photo by WilWheaton
ORGANS:
-Liver: produces bile, which helps digest fat. It
Also stores some nutrients and breaks down substances in the blood.
-Gallbladder: bile produced by the liver is stored in it until it is released to the small intestine when its needed.
-Pancreas: produces enzymes that flow into the small intestine
( enzymes neutralize stomach acid that is mixed with the food)
Photo by Mukumbura
MOUTH:
Mechanical digestion begins in the mouth where teeth shred food. The tongue mixes the food with saliva, which is a mixture of water and enzymes produced by the salivary glands.
Saliva begins the process of
chemical digestion.
Photo by davi sommerfeld
ESOPHAGUS:
After the food becomes soft and moist, the tongue pushes it to the esophagus. Rhythmic contractions of the smooth muscles in the esophagus push the food toward the opening of the
stomach.
Photo by Tc Morgan
STOMACH:
The stomach continues the mechanical digestion by squeezing its contents with muscular contractions. Glands in the stomach produce enzymes and acid that begin the breakdown of proteins. The acid also kills bacteria that have been swallowed
with food.
Photo by @Doug88888
SMALL INTESTINE:
Tiny fingerlike projections, called villi, line the small intestine.
Digested food passes into the blood through the walls
of the villi.
These structures increase the surface area, where digested materials can be absorbed into the blood.
Photo by Kalexanderson
LARGE INTESTINE:
Materials that cannot be absorbed into the bloodstream pass into the large intestine.
The large intestine absorbs water from the undigested material and stored solid wastes until
they leave the body.
Photo by Rob Boudon
