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A Guided Tour of the Digestive System
Transcript of A Guided Tour of the Digestive System
By Shelby Cane
Hi guys! I'm a slice
of pizza. Let's see
what happens when
a human eats me!
Meet your tour guide!
First Stop: The Mouth!
Can't wait to
Both mechanical and chemical digestion take place in the mouth! The teeth will chew me while the enzyme
breaks down my starch. The mouth also kills germs that might be on me and lubricates food with the protein
Next Stop: The Stomach!
does a lot of
The stomach stores food (for example, pieces of pizza like me)! It also disinfects food using
. Chemical digestion also occurs in the stomach. Enzymes such as
are secreted to break down proteins.
Next Stop: The Small Intestine!
The small intestine chemically digests food. It also absorbs nutrients into the bloodstream through its lining. The small intestine has three parts: the
, where most of the chemical digestion occurs; and the
, where absorption of water and nutrients occurs. Additionally, the lining of the small intestine has finger-like projections called
that increase the surface area in order to increase absorption!
Next Stop: The Large Intestine
The large intestine re-absorbs water. If there is too much water in the colon,
occurs. If there isn't enough water in the colon,
occurs. Bacteria such as
live in the large intestine.
The last section of the colon, called the
, eliminates feces.
Solid waste is eliminated as feces and liquid waste is eliminated as urine.
Accessory Gland Detour: The Pancreas
The pancreas produces digestive enzymes such as
. It also produces buffer solutions to reduce the acidity of materials from the stomach.
Accessory Gland Detour: The Liver and Gallbladder
Lots of bile,
The liver produces
, which is stored in the gallbladder. The liver also breaks up fats.