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!
Explain the Nerve Cell Structure and Function?
Before studying the organization of the nervous system, we will look at the relationship between structure and function of nerve and associated cells. The typical nerve cell or neuron has a cell body containing the nucleus, and an elongated extension called an axon that carries electrical signals called impulses away from the cell body. The axon is frayed at the end to form many synaptic terminals that transmit the nerve impulse to a target cell in a contact space called a synapse. The nerve impulse is carried across the synapse by certain chemicals called neurotransmitters. These chemicals are enclosed in synaptic vesicles that fuse with the presynaptic membrane and are released in response to a nerve impulse that reaches the axon terminal. Neurotransmitters bind to the postsynaptic membrane of the target cell, which can be a muscle, a gland, or the terminals of another neuron that takes over to propagate the nerve impulse. After the impulse is propagated, enzymes in the synaptic space break down the remaining neurotransmitter chemicals.
Surrounding the nerve cell body are short, branched extensions called dendrites, that bind neurotransmitters released by other neurons or by sensory receptors, cells associated with the five senses - touch, vision, hearing, taste, and smell. Some sensory receptors are actually specialized neurons.
Axons of some nerve cells are surrounded by a protective sheath of membranous material called myelin, produced by accessory cells called Schwann cells. Myelin gives bundled nerves their white appearance. Myelin is not continuous along the axon, but the sheath is interrupted at regular intervals called nodes of Ranvier, where the nerve is unmyelinated.
What do alcohol and illicit drugs do to the brain Whether its alcohol, nicotine, prescription painkillers, heroin, or cocaine addictive substances change the brain in fundament
Q. What are the environmental harms caused by mercury pollution? What are the main sources of mercury pollution? The Mercury is a metal that when present in the water of rivers
Define the term - innor mitochondrial membrane The innor mitochondrial membrane has about 60 different proteins associated with it. The outer membrane is associated with some
What are the two main types of endocytosis? Endocytosis can be divided as pinocytosis or phagocytosis. In pinocytosis small particles on the external surface of the membrane ex
Explain some Limitations of Most Probable Number? 1. Large quantity of glassware is required. 2. Colony morphology cannot be determined. 3. It lacks precision.
Q. What are the major divisions of the hypophysis? What are their functions? The hypophysis is divided into two portions- the anterior hypophysis or adenohypophysis and the pos
Criteria of Essentiality Amon and Stout as early as 1939, suggested certain criteria that an element must fulfil in order to be classified as essential. These criteria are lis
Define about the Carbohydrates? In the previous unit, we came to know that availability of glucose is the major factor in exercise performance. Hence, carbohydrate manipulation
While studying evolution, a student comes across a cladogram that includes clades like amphibia, reptilia, aves, and mammalia. What must be the basal clade?
Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4 What are the two mai
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