Maintenance of gut lining, Biology

Assignment Help:

Maintenance of Gut Lining

After studying the digestive enzymes you would wonder why the gut linings are not digested themselves. This is because animals have several mechanisms that protect their gut lining from auto digestion. The mucous membranes of vertebrates secrete a slightly alkaline mucous that lubricates the food and protects the lining cells from corrosive secretions.

In addition, the lateral surfaces of exposed epithelial cells are joined by tight junctions that prevent the secretions from penetrating between them. Careful studies have also revealed that the entire lining of the gut is renewed every third day in rats and every 2-6 days in humans. Similar mechanisms are present in invertebrates also. In insects, the fore-gut and hind gut are lined by cuticle. This lining is known as intima. Only in the midgut, the epithelial cells are exposed, where most of the digestion occurs. The midgut is lined by a delicate lining the peritrophic membrane in some insects. This corresponds to the mucous lining of vertebrates.


Related Discussions:- Maintenance of gut lining

What are synthetic auxins, What are synthetic auxins and what are their use...

What are synthetic auxins and what are their uses? Synthetic auxins, like indolebutyric acid (IBA) and naphthalenic acid (NAA) are substances same to IAA (a natural auxin) but

How can you explain atp synthesis, Q. How in the respiratory chain do elect...

Q. How in the respiratory chain do electrons from NADH2 and FADH2 passing through cytochromes liberate energy for the ATP synthesis? What is this ATP synthesis called? NADH2and

Food intoxications, Food borne intoxications are basically food borne illne...

Food borne intoxications are basically food borne illness caused due to ingestion of toxin produced my microorganisms (mycotoxins, bacterial toxins). Natural toxins present in food

Systematics, binomial nomenclature is not applicable to

binomial nomenclature is not applicable to

Why greenhouse gases lead to global warming, Explain briefly why 'greenhous...

Explain briefly why 'greenhouse' gases lead to global warming. The greenhouse gases do not interfere with the short-wave radiation reaching the Earth from the sun but take up t

GRADE 8 SCIENCE, what effects do human technologies have on our water syste...

what effects do human technologies have on our water systems?

What is relationship cph in photon and frequency of photon, what is relatio...

what is relationship between numbers CPH in photon and frequency of photon? Answer; the photon contains n CPH and its energy is E=hν, when photons energy increases that the num

What is manifest squint, What is Manifest Squint (Heterotropia) Manifes...

What is Manifest Squint (Heterotropia) Manifest squint is a deviation of one eye from the normal position when the fusion reflex is present. The subcategories of manifest squin

The principle of dna cloning, Assume an experimental target that is to make...

Assume an experimental target that is to make vast amounts of a particular DNA fragment in pure form from a combination of DNA fragments.  Whereas the DNA fragments can be introduc

Characteristics of man, CHARACTERISTIC S OF MAN - Humans posses ere...

CHARACTERISTIC S OF MAN - Humans posses erect posture and bipedal locomotion. Humans possess large sized brain. Humans are less dependent on smell. Humans possess

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