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GIT 2 functions of digestive system - Coggle Diagram
GIT 2
functions of digestive system
The GIT is responsible for:
breaking down food and
supplying the body with water, nutrients, and electrolytes needed to sustain life.
This is brought about by the following processes:
Ingestion
involves:
placing the food into the mouth;
chewing the food into smaller pieces (mastication);
moistening the food with salivary secretions;
swallowing the food (deglutition).
Digestion
During digestion:
food is broken down into small particles
by grinding action of the GIT
and then degraded by digestive enzymes
into usable nutrients.
Starches
are degraded by ‘amylases’
into monosaccharides.
Proteins
are degraded by a variety of proteases
into
dipeptides and
amino acids.
Fats
are degraded by ‘lipases’ and esterase
into
monoglycerides and
free fatty acids.
Absorption
During absorption,
nutrients,
water and
electrolytes
are transported from the GIT
(mainly from the small intestine)
to the circulation.
Egestion
During egestion,
the undigested food,
along with various secretions and
sloughed-off epithelial cells from the GIT, pass into rectum and
constitute the faeces
which are voided through the anus
at periodic intervals.