Digestive system - large intestine, Biology

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.

Posted Date: 10/1/2012 7:41:05 AM | Location : United States







Related Discussions:- Digestive system - large intestine, Assignment Help, Ask Question on Digestive system - large intestine, Get Answer, Expert's Help, Digestive system - large intestine Discussions

Write discussion on Digestive system - large intestine
Your posts are moderated
Related Questions
Q. What are the structures that compose the human vision apparatus? The organs of the human visual apparatus are the eyes the optical nerves and the visual areas of the brain l

what major nerve do you think is being compressed when a person often feel pain in the posterior surface of the thigh radiating to the area behind the knee and where is the likely

Explain Ventilation, Chest Compressions? Even when the first three defibrillation attempts fail, the best chance of resuscitation still lies in successful defibrillation. Hence

Atherosclerosis, the most common part of hardening of the arteries, is characterized by the presence of cholesterol-rich arterial thickenings (atheromas).  This progressive  diseas

This valve has the same basic features as  of the Tricuspid Valve. It has an anterior and a posterior cusp. The anterior cusp is larger and is attached on the upper right part of t

R a d i o g r a p h y: Radiograph or X-ray remains the most well-known and primary diagnostic tool of all the imaging modalities. It works b

Berry - Development of Seed In a berry much of the pericarp is fleshy or juicy. In tomato Lycopersicon esculentum even the placenta on which the seeds are borne is fleshy. The

Two chromosomes in a cell have identical length and centromere position yet are not homologous, what is different about them

binomial nomenclature is not applicable to

1.      Effect on general health:          Noise pollution increases the rate of heart beat, constriction of blood vessels and blood pressure. Noise also causes anxiety, stres