S3 teaching practice ppt1

1. HUMAN DIGESTIVE SYSTEM
PRESENTED BY,
ANCY .A.R
NATURAL SCIENCE
CHRIST NAGAR COLLEGE OF EDUCATION

3. Human beings have a complex digestive
system.
Our digestive system is a long tube that
begins at the mouth and ends at the
anus.
This long muscular tube is called the
alimentary canal or gut.

4.  MOUTH : Digestion begins in the mouth
where teeth cut and crush food into small
pieces.
 OESOPHAGUS (Food pipe): It is a muscular
tube that transports food from the throat to
the stomach.
 STOMACH: It is the major organ of the human
digestive system. It stores and churns food.

5.  SMALL INTESTINE : Most food is digested in
the small intestine. This is where nutrients are
released and taken into the blood to be used
by the body.
 LARGE INTESTINE : Water from digested food
is absorbed in the large intestine. Any leftover
waste forms faeces.

6.  RECTUM : Faeces are stored in the final part
of large intestine, called the rectum, before
leaving the body.
 ANUS : The anus is the opening at the end of
the digestive tract and faeces passes out
through this end.

7.  Apart from these organs, glands like salivary
glands, liver and pancreas also play an
important role in the process of digestion.
• Salivary glands----secretes saliva.
• Liver---secretes bile (breakdown of fat).
• Pancreas-------secretes pancreatic juice
(breakdown of carbohydrates, proteins and
fats).