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DIGESTIVE SYSTEM
BY
•BHAVYA.V.S
•CHANDRAKALA.R
•JAYASHREE.M
•BHAVANA.R
•RASHMI.R
•DEVI.A
MAIN FUNCTION OF DIGESTIVE
SYSTEM IS DIGESTION.
Digestion is conversion of
complex larger food
molecules into simpler
smaller molecules by
the action of enzymes
for easy absorption
Two types of digestion
a) Mechanical digestion :- It is breaking
up of larger particles of food into fine
paste with the help of teeth & tongue.
b) Chemical digestion :- It is the
hydrolysis of food into simplest
particles by the action of enzymes.
DIGESTIVE SYSTEM
It is a group of organs which helps in supply
of nutrients by the food we consume with the
help of its parts.
Parts of digestive
system
a)Mouth
b)Pharynx
c) Epiglottis
d)Trachea
e)Oesophagus
f) Stomach
g)Liver
h) Pancreas
i) Small Intestine
J) Duodenum
k) Large Intestine
L ) Rectum &
m) Anus
MOUTH & PHARYNX
Mouth is the first part of digestive
system. It leads into Buccal cavity
which leads into teeth & tongue.
Mouth secretes salivary juice.
Pharynx is the common passage for
both food which leads into
Oesophagus.
Epiglottis & esophagus.
Larynx is a part of respiratory
system) temporarily closed by
cartilaginous flap called
epiglottis.
Esophagus is a muscular tube
connecting pharynx with
stomach. It helps to push the
bolus downwards into stomach.
Stomach
It is a big shaped muscular organ.
The layers of muscles in the wall of
muscle contract & relax bringing
about churning movement of food.
Gastric juice is produced inside the
stomach.
Liver & gall bladder
Liver produces bile juice which is
basic in nature. This bile juice is
basic in nature because the acidified
food in our stomach. The bile juice
produced in the liver is stored in
the gall bladder.
Pancreas
It is a feather like structure where
pancreatic juice is produced.
Pancreatic juice contains the
following enzymes:1)Amylase
2)Pancreatic lipase.
Small intestine & Duodenum.
The absorption of digestion of food
takes place in small intestine
through villi finger like structure.
After the absorption, the food is
turned into a semi liquid known
as chyme which will be pushed
into the first part of small intestine
namely duodenum.
Large intestine.
After the absorption of food, the
undigested food is then passed into
large intestine. Large intestine or
colon begins as pouch called
caecum. The wall of large intestine
absorbs water & salt from the
undigested food.
Rectum & Anus.
Rectum is a part where waste
substances of our body is stored.
Anus is the last part where waste
substances are removed out of our
body.
We thank our science teacher
& computer teachers for
helping us to do this project.