Giant nerve fibres, Biology

Assignment Help:

Giant Nerve Fibres

We now know that giant nerve fibres take place in the central nervous system of many polychaetes, oligochaetes, insects cephalopod etc. They are broader and longer as compared to the other, ordinary nerve fibres which are about 2 μm or so only in diameter. In the squid, they might attain a diameter of 700 μm or even more. Their size makes them ideal material for electrophysiological studies, like recording electrodes can be inserted inside the axons and action potentials measured. They are of immense benefit to the animal because, with the increase in diameter of the axon, resistance for propagation of action potential is decreased, while velocity of propagation is increased. They conduct for longer distances with fewer or no synapses that also further facilitate conduction. On the whole they are pre-eminently suited for rapid conduction. These Fibres are included in escape reactions of the animal. The squid for instance is rapidly propelled in water by expelling the water within the mantle cavity by fast and simultaneous contraction of the muscles of the mantle innervated by the giant fibres by using the principle of jet propulsion. The animal can escape from its enemies through this method within a fraction of a second.


Related Discussions:- Giant nerve fibres

Complementation of genes, how would one determine that the wild type phenot...

how would one determine that the wild type phenotype of a certain trait is due to the action of one or two genes?

Define methods of prevention and control of anaemia, Define methods of prev...

Define methods of prevention and control of anaemia? The available methods of prevention and control of anaemia are: Supplementation Food fortification Dietary

Define role of lipids in controlling gene expression, Define role of Lipids...

Define role of Lipids in Controlling Gene Expression? In the lipogenic pathway, the genes that encode the enzymes of the fatty acid synthase complex are co-ordinately expressed

Composition - culture medium, Composition - Culture Medium A standard ...

Composition - Culture Medium A standard plant tissue culture medium (Basal medium) contains all the essential macro elements (Carbon, hydrogen, oxygen nitrogen, phosphorus, su

Clinical use of brain imaging in disease management, Determine the Clinical...

Determine the Clinical use of brain imaging in disease management Clinical use of brain imaging in disease management has also grown, driven by broader availability of scannin

Diffrence between fish epidermis and amphibian epidermis, Q. How different ...

Q. How different is the fish epidermis from the amphibian epidermis? The fish epidermis is very contains and thin mucus-secreting cells the fish skin doesn't present keratin, t

Causes of non-ketotic hyperosmolar diabetic coma, Q. Causes of Non-Ketotic ...

Q. Causes of Non-Ketotic Hyperosmolar Diabetic Coma? The causes of NKHDC are given below: 1) Infections 2) Trauma 3) Burns 4) Myocardial Infarctions (heart attack)

Describe the filaments in the muscle fiber, Describe the filaments in the m...

Describe the filaments in the muscle fiber A healthy skeletal muscle fiber is isolated and has no external forces on it. It has normal intracellular levels of ATP and is bathed

Sense organs, difference between optic nerve and auditory nerve

difference between optic nerve and auditory nerve

Enumerate various factors controlling osseointegration, Q. Enumerate variou...

Q. Enumerate various factors controlling osseointegration? The factors controlling osseointegration are: i) Occlusal load ii) Biocompatibility of the material iii) Imp

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