Explain the barrier function in the cornea, Biology

Assignment Help:

Explain the barrier function in the cornea.

Barrier Function:

It is the first line of barrier between the external environment and the corneal stroma. The superficial epithelial cells are encircled by tight junctions (zonula occludens).

These superficial epithelial cells serve as semi-pernieable high resistance (12- 16kQ) membrane. It prevents niovement of fluid from tear to stroma. It is useful for maintenance of epithelial barrier. The maintenance is done by mitosis of basal cells and migration of new basal cells from the limbal stern cells. So the corneal epithelium is maintained by a balance among the process of centripetal cell migration (120pm/wk), mitosis, and shedding of superficial cells. The XYZ hypothesis of corneal epithelial maintenance by Thoft and Friend is X+Y=Z. The limbal epithelium has the highest mitotic rate followed by peripheral cells and central cells have the lowest mitotic mte.


Related Discussions:- Explain the barrier function in the cornea

Summary of economic dimensions of financing healthcare, Normal 0 ...

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Carrier based gutta percha removal -therma-fill, Carrier Based Gutta percha...

Carrier Based Gutta percha Removal “therma-fill” If the cone the carrier is metal and has cutting flutes that are engaging lateral dentin the instrument retrieval system (IRS)

What is gum arabic, Gum Arabic Gum Arabic or Gum Acacia is the oldest  ...

Gum Arabic Gum Arabic or Gum Acacia is the oldest  and best known of the natural gums. Gum Arabic is the natural exudate produced by various species of the thorny Acacia trees

What are anteromedial aspects of temporal lobes, Q. What are anteromedial a...

Q. What are anteromedial aspects of temporal lobes? Olfactory Cortex - found in anteromedial aspects of temporal lobes receive sensory information directly from the olfactory n

Phylum coelenterata, what is the food getting habits of phylum coelenterata...

what is the food getting habits of phylum coelenterata?

What are the vitamins which make up the b complex, Q. What are the vitamins...

Q. What are the vitamins which make up the B complex? Which problems does the lack of these vitamins cause? Vitamins of the B complex are: vitamin B1 or thiamin, riboflavin, or

Formation of identical twins and fraternal twins, Describe the events whic...

Describe the events which lead to the formation of (a) identical twins, (b) fraternal twins.   (a) Identical twins are derived from the products of a one zygote which separa

What do ypu know about conduction disturabances, Q. What do ypu know about ...

Q. What do ypu know about Conduction Disturabances? During exercise there is an increase in the sympathetic drive and a withdrawal of vagal tone. Sympathetic enhancement of con

What are neoplasias, Q. What are neoplasias? The Neoplasia is any abnor...

Q. What are neoplasias? The Neoplasia is any abnormal and uncontrolled proliferation of cells of an organism. The Neoplasias can be benign or malign and benign neoplasias are t

Explain the sporangiophores features of rhizopus, Explain the Sporangiophor...

Explain the Sporangiophores features of Rhizopus? 1. Sporangiophores swell at the tip into a spherical knob like structure called sporangium. It has two zones. - Central dom

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