The human digestive system has 5 stages: ingestion, digestion, absorption, assimilation, and egestion. Ingestion involves taking food into the mouth. Digestion begins in the mouth through chewing and saliva. Food then moves to the stomach through the esophagus. In the stomach, food is churned by gastric juices containing acids and enzymes. The partly digested food then moves to the small intestine, where enzymes from the liver, pancreas, and intestine complete digestion by breaking nutrients into small molecules. Absorption then occurs in the small intestine as nutrients pass into the bloodstream. Assimilation involves cells taking nutrients from the blood for energy, growth, and repair. Undigested waste moves to the

1. HUMAN DIGESTIVE
SYSTEM
BY-
K.VINEEL

2. NUTRITION IN HUMAN
THERE ARE 5 TYPES OF NUTRITION-
1]INGESTION
2]DIGESTION
3]ABSORPTION
4]ASSIMILATION
5]EGESTION
[OR]
DEFECATION

3. 1.INGESTION
The human
beings have
special organ
called Mouth.
To
ingest
the food
through
the
Mouth.These
are kept with
the help of
mouth.

4. 2]D

5. DSA
 As per prev fig when the food passes through mouth itself the
digestion starts .The teeth chews the food and grinds it with the
help of saliva the food digests this saliva contains salivary
amylase.Where the starch of the food changes into sugar.Thus,
the digestion of carbohydrate begins in the mouth.The food
remains in mouth at short time.Since the digestion is
incomplete.
 The slightly digested food goes through oesophagus as pic in
next page. It carries towards Jshaped stonach the walls of
oesophagus has muscles which contract and expand.This
movement is known as PERISTALTIC MOVEMENT.This
movement leads tostomach

6. OESOPHAGUS STOMACH
INNER WALLS LOCATION

7.  In stomach it churns food about 3hr
.During this time the food particles
becomes into small and semi-solid
paste.The glands present at the stomach
of stomach contains gastric juice .The
gastric juice contains 3 enzymes in those
Hcl is acid and pepsin and mucus are
enzymes due to this Hcl acid over
production acidity is created and then
pepsin is active with acid. So pepsin can
digest proteins properly .Another function
of Hcl is to kill bacteria .The mucus helps
to protect stomach . If it is not secreted
then Hcl will form ulcers in the
stomach.Then the food directly goes to
small intestine

8. From the stomach the digested food
goes to small intestine which is at
On the screen towards right which is
6.5m long in adult man .It is still longer in
herbivores as they should digest grass or leaves
and for carnivores there
Is small.

9. LIVER-LEFT
Stomach-middle,
Pancraes-right

10.  The small intestine in human is the site of
complete digeston of food happens as follows:
 A] The small intestine has two glands:liver and
pancreas as b4 slide . Liver secrets bile which
is located in gall bladder.This is helped to break
down of lipids.It functions 2 :1)makes the acidic
food coming from the stomach so pancrese
acts on it 2)bile salts break the fats present in
food and makes easy to digest.Pancreas
secretes pancreatic juice which contains
enzymes like pancreatic amylase,trisin and
lipase.

11. AFTER DIGESTION ,THE MOLECULES
OF FOOD SO
SMALL THEY CAN’T PASS
THROUGH WALLS OF SMALL
INTESTINE. THE SMALL INTESTINE IS
REIGON WHERE ABSORPTION OF
MAIN FOOD IS TAKEN PLACE. THE
FINGER LIKE PROJECTIONS IS
CALLED VILLI.WHERE DIGESTED FOOD
GOES TO BLOOD.

12. 4]ASSIMILATON
 The blood carries digested and dissolved
food goes at the parts of cells.Due to this
assimilated food the body cells obtain energy
for growth and repair of body . The energy is
released by oxdation of assimilated food in
the cell during respiration . The digested food
is not used by our body in the form of
‘glycogen’. This stored glycogen can be used
as a source of energy by the body as and
when required.

13. 5]EGESTION
 The part which can’t
be digested by our
body The undigested
cannot be in small
intestine so it goes to
large intestine. There
the waste food is
excreted through
rectum.

14. TO-
SWEATHA MAM