Digestion is a multi-step process where food is broken down from large insoluble molecules to smaller soluble molecules that can be absorbed into the bloodstream. The main steps are ingestion, digestion, absorption, assimilation, and egestion. There are two types of digestion: extracellular digestion which occurs outside cells and intracellular digestion which occurs inside cells. The alimentary canal aids in digestion, consisting of the mouth, esophagus, stomach, small intestine (made up of the duodenum, jejunum and ileum), and large intestine (made up of the caecum, colon and rectum).

1. General Science Final

2. Definition
•Digestion is a process in which un-soluble
large, complex food molecules are broken
down into smaller, simple molecules that can
be absorbed into the bloodstream.
Explanation:
•After ingestion, food must be digested
before it can be absorbed into the cells of
body.

3. The process of Digestion is completed in following steps:
1.Ingestion:
The process in which animal take in food by swallowing or
absorption is known as ingestion
2. Digestion:
It is a complex process in which a large insoluble food
particles are converted into smaller simple soluble
molecules capable of passing through the membranes.
3. Absorption
The passage of material through the lining of the intestine
into the blood or through a cell membrane into a cell.

4. 4.Assimilation:
Incorporation of nutrients into the cell or It can be
defined as the process in which the absorbed food
material is converted into stored form and stored at
various places in body
5.Egestion:
It is the process in which the undigested food is
removed from the body as a waste product through
anus.

5. There are basically 2 types of Digestions:
1.Extra Cellular Digestion: Digestion that takes place
outside the cell in a special cavity or tube, after which
the soluble molecules are absorbed into the cells.
2.Intracellular Digestion: Digestion that takes place
within the cell.

6. 1. Alimentary Canal
•A large coiled tube extended from
mouth to anus.

7. •External opening guarded by lips
•Digestion of carbohydrate begins here.
•Saliva is secreted by salivary glands.
•Saliva contains enzymes (Ptyalin &
lysozymes) , water & mucus.

8. •Common passage for both air and
food
•Responsible for swallowing of
food and forming of bolus.

9. •It is a passage of food from
pharynx to stomach.

10. •Stores food for 2-4 hours.
•Secrete gastric juices that
contain enzymes, HCL &
mucus.
•Enzymes are pepsinogen
and renin.
•By the result of Digestion
food become paste like
called as CHYME.

11. •The average length of the
small intestine in an adult
human male is 6.9 m (22 feet
6 inches).
•Adult female 7.1 m (23 feet 4
inches).

12. Consisting of :
1.Duodenum
2.Jejunum
3.Ileum

13. •Chyme enters
duodenum where it
mixes with digestive
juices
•Digestive juices are
produced by Liver,
Pancreas & Intestinal
glands.

14. •Digestion of food is
completed here.

15. •A site of final absorption of
nutrients like glucose & amino
acids.
•Finger like projections called
villi absorb food material.
•Blood capillaries absorb
glucose & amino acids.
•Lymph capillaries called
lacteals absorb fatty acids.

16. •A site of final absorption of
water & minerals.
•Consist of Caecum,
Ascending Colon, Transverse
Colon, Descending Colon,
Sigmoid Colon & Rectum.

17. •Rectum stores the faeces
that is later on egested by
Anus.