17.
The majority of digestion in humans takes place in the
s. Draped
over these is a flap called the greater
m. This flap has fat for
n
and many blood vessels for
t. Thus, the greater omentum may be compared to an
"
c
t" for the small intestines.
18.
The saliva contains enzymes which initiate the digestion of complex
s.
In the stomach, the gastric glands produce enzymes which initiate the digestion
of
s.
In the small intestines, there are digestive enzymes for c
sl
s, and
p
s. These enzymes are found in the fluids produced by the p
and
glands in the m
a of the small intestines. Moreover, the liver produces a fluid
called
, which is stored in the g
r for release into the small intestines; this
fluid helps in the digestion of
s.
19.
The absorptive area of the walls of the small intestines is increased by
permanent circular
s (plicae circulares) and by finger like processes called
i.
20.
Simple sugars and amino acids are absorbed into the
d capillaries. Most
of the fatty acids and glycerol are absorbed into the
c capillaries.
21.
The blood capillaries absorbing substances from the digestive tract join to form
the h
cp
l v
s system. A venous p
l system begins in
s,
which join to form
s, which in turn end in another group of
s. The
hepatic portal vein carries blood from the absorptive area of the digestive system to the
_______.
22.
In the liver, excess materials are removed and
d. For example, some
glucose is stored as
n. Toxic materials are degraded. Microorganisms are
r_______d. The "treated" blood is then routed from the liver to the
and then
throughout the body.
23.
Lipid materials are stored as
throughout the body so that they will be
available when needed for
y.
24.
The lumen of the digestive system connects directly with the s
ing
e__________t. For this reason, special
ve mechanisms are associated with
the human digestive system. Such mechanisms belong to the reticulo
system.
MD0007
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