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!
Myelinated fibre
Axon is a relatively long process (also quite often referred to as nerve fibre) and can be considered as functionally specialised for conduction of excitation over considerable distances. In vertebrates the axons of high velocity neurons are covered by insulating sheaths of lipid containing myelin. This myelin is made up of special glial cells -the Schwann cells. The myelin covering is not continuous. There are tiny uninsulated gaps between adjacent Schwann cells. These are the-nodes of Ranvier. The myelin covering and nodes of Ranvier help accelerate the speed of conduction of impulses by a mechanism which we will discuss later. The terminal part of the axon branches, terminating into small ramifications whose tips form end knobs which synaptically contact with other nerve cells. In the end knobs are present characteristic structures called synaptic vesicles which contain and store chemical substances called neurotransmitters.
Figure: Myelinated fibre
The diversity in neuron form, however so much that is there can be many variations from the generalized description given above. For example, the nerve cells called amacrine cells found in retina contain processes without a demonstrable axon.
Q. What is the difference between ectoparasite and endoparasite? The Ectoparasites are parasites that explore the external surface of the host (like, for instance, mites that p
Define Function of the Iron Uptake by Cells? Iron has several vital functions in the body. It serves as a carrier of oxygen to the tissues from the lungs by red blood cell haem
Concerning reproduction what is the function of the testicles? The testicles are the male gonads, i.e., the organs where the production of gametes takes place. In human beings
What is sustainability? Sustainability is the ability to meet human needsin a way that will allow a human population to survive indefinitely.
Define Structural Elements - Biological Functions of Proteins? Structural proteins are fibrous proteins. The well known of the fibrous proteins are possibly the keratins, which
What is cytoskeleton? What are its main constituents in animal cells? Ans) Cytoskeleton is the cytoplasmic structure that handles the cell, keeps its shape and fixates and moves
List out the Principles of Food Preservation? All food preservation methods are based upon the general principle of preventing or retarding the causes of spoilage caused by mic
PKU is a recessive disorder. Suppose two people who were heterozygous for PKU married and had a child. What is the probability that the child will have PKU?
Define needs of Vitamins arid Minerals in Postoperative Nutritional Care? Vitamins are required for wound healing after a surgery. Vitamin C provides the cementing material of
why left brain controls right side of the body and right brain controls left side of the body....?????
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: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd