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!
Conduction in Myelinated Axons
The myelin sheath provides insulation for the axon preventing movements of Na+ and K+ through the membrane. Therefore, if this myelin sheath was continuous no action potential would be generated. Fortunately, gaps or nodes of Ranvier occur in the myelin. Since the cable properties of axon can conduct depolarisations over very short distance (1-2 mm), the nodes of Ranvier must be close together (actually they are 1 mm apart). Studies have shown that the Na+ channels are concentrated at the nodes and absent from the regions between two nodes. Action potential therefore occurs only at the nodes of Ranvier and seems to leap from node to node. This is called saltatory conduction. The spread of depolarisation between the nodes is very fast and fewer action potentials are needed. Therefore, the rate of conduction is much faster than in unmyelinated fibres.
This peculiar structure and mode of conduction in myelinated fibres is responsible for the fast conduction of impulses in motor nerves of vertebrates even though the nerves are very thin. The greatest advantage of myelinated fibres comes from their smaller size and so a highly complex nervous system with high conduction velocities can occur without occupying too much of space.
Explain function of lymph nodes? Lymph nodes have white blood cells which ingest bacteria and prevent them from reaching the circulation.
What are the types of brain?
What is Ridgemapping The patient is given local anesthesia by infiltration to numb both the facial (labial/buccal) and lingual (palatal) mucosa. Using either a sharp straigh
What is gluconeogenesis There is accumulation of lactate, which is released into the blood and taken up by the liver where it is converted to glucose by the process called
What is lamarckism? The Lamarckism is the theory that unites the law of use and disuse with the law of the transmission of acquired characteristics that is that asserted that a
Define about the Deficiency of cyanocobalamin? Malabsorption of vitamin B 12 can occur at several points during digestion. By far, the most important condition resulting in v
What is the best microscope to get a detailed view of the parts inside of a preserved plant cell
What is Ground Meristem in primary growing shoot? The ground meristem produces new cells which ultimately develop into parenchyma cells. The central portion of the primary shoo
Define Nutritional Management of Eating Disorders? In the last unit, we focused on weight management. It is important to understand that the problems associated with too much d
Determine the posterior superior alveolar nerves The anterior, middle and posterior superior alveolar nerves run in the facial wall of the maxillary sinus between its lining me
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