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A Guided Tour of the Digestive System

IB Biology
by

Shelby Cane

on 2 February 2015

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Transcript of A Guided Tour of the Digestive System

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
be ingested!
Both mechanical and chemical digestion take place in the mouth! The teeth will chew me while the enzyme
amylase
breaks down my starch. The mouth also kills germs that might be on me and lubricates food with the protein
mucin
!
Wooo, down
the
esophagus!
Next Stop: The Stomach!
The stomach
does a lot of
work!
The stomach stores food (for example, pieces of pizza like me)! It also disinfects food using
hydrochloric acid
. Chemical digestion also occurs in the stomach. Enzymes such as
pepsinogen
are secreted to break down proteins.
Next Stop: The Small Intestine!
Lots of
twists
and turns!
The small intestine chemically digests food. It also absorbs nutrients into the bloodstream through its lining. The small intestine has three parts: the
duodenum
, where most of the chemical digestion occurs; and the
jejunum
and the
ileum
, where absorption of water and nutrients occurs. Additionally, the lining of the small intestine has finger-like projections called
villi
and
microvilli
that increase the surface area in order to increase absorption!
Next Stop: The Large Intestine
Almost done
being
digested!
The large intestine re-absorbs water. If there is too much water in the colon,
diarrhea
occurs. If there isn't enough water in the colon,
constipation
occurs. Bacteria such as
E. coli
live in the large intestine.
The last section of the colon, called the
rectum
, eliminates feces.
Last stop!
Solid waste is eliminated as feces and liquid waste is eliminated as urine.
Now I'm
feces!
...and I'm
urine!
Accessory Gland Detour: The Pancreas
The pancreas
is behind
the stomach!
The pancreas produces digestive enzymes such as
trypsin
. It also produces buffer solutions to reduce the acidity of materials from the stomach.
Accessory Gland Detour: The Liver and Gallbladder
Lots of bile,
perfect for
surfing!
The liver produces
bile
, which is stored in the gallbladder. The liver also breaks up fats.
Full transcript