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

What is the expected phenotypic proportion, In tomatoes, two alleles of one...

In tomatoes, two alleles of one locus determine the character difference of purple versus green stems (alleles are P and p with P being completely dominatn and coding for purple st

Determine about the national adult reading test, Determine about the Nation...

Determine about the National Adult Reading Test The National Adult Reading Test (NART; Nelson, 1982) allows the researcher to obtain an estimate of an individual's IQ prior to

What are some significant neurotransmitters?, What are some significant neu...

What are some significant neurotransmitters? The following are some neurotransmitters: adrenaline (epinephrine), noradrenaline (norepinephrine), dopamine, acetylcholine, seroto

Gastrulation in some animals, Gastrulation in some Animals As mentione...

Gastrulation in some Animals As mentioned before gastrulation marks the beginning of morphogenesis that is development of body form and organisation of cells in the embryo. By

What do you mean by pericardium, Q. What do you mean by Pericardium? Pe...

Q. What do you mean by Pericardium? Pericardium is the sac covering the heart. Pericardium consists of two layers-the visceral pericardium (epicardium) and the parietal pericar

What are quantitative data, What are quantitative data? Give two examples o...

What are quantitative data? Give two examples of quantitative data. Quantitative data are data that can be calculated in numbers. Examples contain the dimensions of an objec

What are the symptom of short bowel syndrome, Q. What are the Symptom of sh...

Q. What are the Symptom of short bowel syndrome? Diarrhoea is the main symptom of short bowel syndrome. Other symptoms include: • Anorexia • Steatorrhoea • Heart bum a

The nutrient composition of the diet, The nutrient composition of the diet ...

The nutrient composition of the diet The nutrient composition of the diet will depend upon the type(s) and amount(s) of liquids the patient can consume.  The diet is low  in  i

How are grasslands classified, How are grasslands classified? Grasslan...

How are grasslands classified? Grasslands might be classified into steppes and savannahs. In the steppes the prevailing vegetation is grass, as in the pampas of South America

Amphibian circulation be classified as incomplete and double, Q. Why can th...

Q. Why can the amphibian circulation be classified as incomplete and double? The amphibian circulation is double because it is composed of pulmonary and systemic circulations r

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd