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

Show the model of behaviour change, Behavior Change Communication (BCC) int...

Behavior Change Communication (BCC) interventions that address diabetes mellitus are designed to promote behaviors that prevent diabetes and complications of diabetes. Behavior cha

Explain evolutionary relationship among animal groups, Evolutionary relatio...

Evolutionary relationship among various animal groups is depicted in the cladogram given below. P, Q and R respectively shown: a.  Vertebrae, hair and four limbs. b.  B

Odyssey, how does odysseus get the dead to talk to him?

how does odysseus get the dead to talk to him?

State the process of metabotropic receptors, State the process of metabotro...

State the process of metabotropic receptors Consider a system that contains two neurons and one cardiac SA node cell in a culture dish bathed in normal physiological saline.  A

Classification of microorganisms, Q. Classification of microorganisms? ...

Q. Classification of microorganisms? The microorganisms use our food as a source of nutrients for their own growth. This, of course can result in deterioration of the food. By

Define salient modifiable factors which affect birth weight, Define salient...

Define salient modifiable factors which affect birth weight? The following are the salient modifiable factors which affect birth weight and gestation adversely: Iron deficiency

Explain brownian movement, Explain brownian movement When you view a so...

Explain brownian movement When you view a sol through an ultra microscope, you will observe that colloidal particles appear to be in a state of rapid and irregular motion calle

Genetics, what about cytoplasmic sex determination

what about cytoplasmic sex determination

Types of muscular tissue, TYPE S -   There are present three types ...

TYPE S -   There are present three types of muscle fibres:   1.      Striped or striated or skeletal or voluntary muscles.   2.      Unstriped or non-striated o

A decrease in blood plasma levels of calcium, A decrease in blood plasma le...

A decrease in blood plasma levels of calcium will lead to A. an increase in the calcium ion excretion in the urine. B. an increase in the calcium ion absorption from the con

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