Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
CELL SURFACE JUNCTIONS
(1) Desmosomes (Maculae adherence) - Thickened circular areas on P.M. of adjacent cells with radiating fibrils in cytoplasm. These fibrils called tonofibrils. Desmosomes generally occurs in epithelial cells and provide cell adhesion. Desmosomes without tonofibrils are called terminal bars.
(2) Tight junction or Zona occludence - outer most layers of two P.M. at the site of attachment fuse completely.
Fused membrane reveals a 5- layered structure. Permeability of ions is more at tight junction. Tight junction occurs in nerve tissue at synapses. (electrical synapse)
(3) Gap junction or Nexus - Fine protein channel (connexon) join two P.M of adjacent cells. Exchange of ions between cells may takes place by protein channels. Desmosomes, Tight junction and Gap junction occurs in animal cell.
(4) Plasmodesmata - Name proposed by strassburger. Cytoplasmic connection bet. Two adjacent cells through pores in cell wall and cell membrane. Plasmodesmata are characteristic of multi-cellular plants and they maintain continuity of cytoplasm between adjacent cells. Plasmodesmata often contain an expanded E.R. termed as desmotubule.
Define Aim of Neotaxonomy or Systematic or Biosystematics The aim of neotaxonomy or systematic or biosystematics is not only to describe, identify and arrange organisms in conv
Of which substance do elastic fibers of the connective tissue are made? What are some functions of these fibers? The elastic fibers are made of a protein called elastin. Ela
Explain Changes in feeding behaviour of infants? On maturation of neuro-muscular system, the body is able to coordinate sucking, swallowing and breathing. Till about three mont
Conventional CABG on Cardiopulmonary Bypass Chest is opened by midline incision and median sternotomy. Simultaneously saphenous vein or radial artery is harvested. 'T
Where are humans from
Explain History of Plant Classification - Ancient Greeks and Romans? Hippocrates, "The Father of Medicine" (460-377 B.C.) is reputed to have been one of Democritus 's disciples
1. Define each term and give an example of an application that uses the following: a. Biocompatible material b. Biodegradable material c. Biomimetic
Is it possible to perform investigation of natural paternity, maternity or brotherhood and sisterhood using the ABO blood typing? By using an ABO blood typing it is possible on
Modified or Semi-synthetic Gums These are natural polymers, which are chemically modified to give a new product with improved functional properties. These also fall into severa
Enzymes utilization in Baking Industry In the baking of bread, the preliminary process involves the mixing of wheat flour (mainly starch and proteins) with yeast and water. Sta
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!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd