Contractile cells, Biology

Assignment Help:

CONTRACTILE CELLS

In addition to above mentioned three types of muscular tissue, there are contractile cells.

These are as follows.

1.      Myoepithelial Cells (= Myoepitheliocytes). These cells are present in salivary glands, mammary glands and sweat glands. They form a sort of epithelium called myoepithelium. Myoepithelial cells contract to expel saliva, milk and sweat from the respective glands. Myopithelial cells are innervated by autonomic nerves. They resemble smooth muscle cells and are involuntary. These cells arise from the ectoderm instead of mesoderm.

2.      Myofibroblasts. These cells resemble fibroblasts but contain actin and myosin arranged as in smooth muscle and are contractile. In fact myofibroblasts are specialised contractile fibroblasts. The contraction of wounds is caused by the shortening of myofibroblasts.

3.      Pericytes. These cells are found around capillaries and venules. They contain actin and myosin. Pericytes can give rise to myofibroblasts and to mesenchymal tissue which can differentiate into fibroblasts and can form new blood vessels.


Related Discussions:- Contractile cells

What is prophylaxis, Q. What is prophylaxis? The Prophylaxis is measure...

Q. What is prophylaxis? The Prophylaxis is measures taken to prevent diseases. For instance, the use of condoms in sexual relations is a prophylaxis against contamination by ag

What is the approximate number, What would be the approximate number of ami...

What would be the approximate number of amino acids of a protein with a mass of 203 kd? Assume an average molecular weight for amino acids of 110 grams/mol.

Commensalism, #quesWhat benefits can commensalism offer to a species..

#quesWhat benefits can commensalism offer to a species..

Mechanisms of sex determination and dosage compensation, XYY humans are fer...

XYY humans are fertile males. XXX humans are fertile females. What do these observations reveal about the mechanisms of sex determination and dosage compensation?

Determine net atp production after complete oxidation, How do you determine...

How do you determine net atp production after complete oxidation to CO2 and H2O using mitochondrial?-oxidation, the TCA cycle, the mitochondrial electron transport chain and oxidat

How gender affects the bmr, How Gender affects the bmr? We have already...

How Gender affects the bmr? We have already emphasized earlier that sex difference in metabolic rates are primarily attributable to difference in body size and composition. Wom

Explain prophylaxis - fungal infection, Prophylaxis   High-risk neutrope...

Prophylaxis   High-risk neutropenic patients, such as those undergoing allogeneic and certain autologous stem cell transplants, and those with hematologic malignancy who are exp

Common features of eye and limb development, Common Features of Eye and Lim...

Common Features of Eye and Limb Development A comparison of the embryonic development of the very much different organs, the eyes and the limb, points to various interesting

Explain the reduction in cancer risk, Explain the Reduction in cancer risk?...

Explain the Reduction in cancer risk? Different cancers, especially colon and breast cancer, has been linked not only to phytates but also to protease inhibitors. In vitro stud

Define the management of epileptic patients, Define the Management of Epile...

Define the Management of Epileptic Patients? The primary treatment of epilepsy is anticonvulsant drugs. The focus of nutritional management is a diet, which is appropriate for

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