Digestive system - large intestine, Biology

Assignment Help:

LARGE INTESTINE -

More wider. Arranged around small intestine in the form of ?. It is 1.5 m long. Villi & microvilli absent.

It shows 3 parts Ceacum, colon & rectum.

(i) Ceacum -

6 cm. wide. At Ileo ceacal junction, Ileoceacal valve is present.

Ceacum bears 8 cm. long vermiform appendix. (vestigeal organ), made up of lymphoid tissue.

Infection of appendix is appendicitis its removal is must i.e. appendictomy.

Ceacum is large in herbivorous for digestion & absorption of cellulose. So symbiotic bacteria and symbiotic protozoa are present.

(ii) Colon -

It is sacculated in appearance due to a series of constriction. It shows ascending colon, transverse colon, de- scending colon & sigmoid or pelvic colon.

In it 3 long bends Taeniae present, around these sac like haustra present having decomposer type of bacteria.

Ammonia is formed in it.

Here undigested food is converted into faeces. In children bacteria develop after 10 days of birth.

(iii) Rectum -

15-20 cm. long. It has longest folds and large blood vessels.

It leads to 2.5 cm. anal canal which open out side by anus.

Some time due to enlargement of rectal veins piles are caused.

Anus is guarded by two sphinctors, inner of involuntary muscles and external of voluntary muscles.

In Aves Bursa febrichi is cloacal thymus.

Related Discussions:- Digestive system - large intestine

By which term liverworts and mosses are characterized, Liverworts and mosse...

Liverworts and mosses are characterized by their lack of vascular conducting tissue. These two groups of liverwort, plants and mosses, are known by which of the below terms: a)

Biosphere, Biosphere Biosphere is that part of the earth where life can...

Biosphere Biosphere is that part of the earth where life can exist. It is a narfqy layer around the surface of the earth. If you visualise the earth to be the size of an apple

How do you verify that a certain gene encodes a certain prot, For homework,...

For homework, I had to prove that a certain catalyst was a protein, then tell how I would purify the protein, then tell how I would clone a human chromosomal region that contains t

Introduction of environment, BASICS OF ENVIRONMENT We live in two world...

BASICS OF ENVIRONMENT We live in two world one is natural world of animals, plants, air, water and soil that was present since the evolution of earth. The other world is of soc

What vector foce does particle b then exert on a, A charged particle A exer...

A charged particle A exerts a force of 2.39uN to the right on charged particle B when the particles are 12.3 mm apart. Particle B moves straight away from A to make the distance be

Overall senescence - senescence, Overall senescence - Senescence Only ...

Overall senescence - Senescence Only the parts above the ground level i.e. The aerial parts die whereas the underground parts survive For example, potato.

Various definitions of species, In biology, a species is smallest and basic...

In biology, a species is smallest and basic unit of classification. Each species is placed within a single genus. For example biological name of human being is homosapiens. Here ho

State the strengths of brief screening measures, Strengths of Brief Screeni...

Strengths of Brief Screening Measures 1) Inexpensive, rapid, portable 2) Needs less training in administration and interpretation 3) Differentiating between dementia and

Explain ledge bypass - non-surgical endodontic retreatment, Explain Ledge b...

Explain Ledge bypass - Non-surgical Endodontic Retreatment Ledge bypass - StSt not NiT cause it has shape memory Ledges from outside the curvatures. The file t

Etiological factors involved in short bowel syndrome, Q. Etiological factor...

Q. Etiological factors involved in short bowel syndrome? The etiological factors involved in this disease are: • Anaemia • Osteoporosis • Stone formation • Decrease

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages