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.
Mention the role o ribosome's in peptide -bond formation .How does ATP facilitate it? a) Of springs derived by asexual reproduction are known as clones. Justify giving two R
Q. What are the three fundamental sexual life cycles studied in Biology? Which of them corresponds to metagenesis? Which of them is the human life cycle? Sexual reproduction ma
Mention where the following are located in the human brain, and give single function of each: a) Temporal lobe b) Cerebellum c) Corpus callosum
what is a homologous chromosome
Advantages of Stage two done with tissue punch - Less traumatic to surrounding tissue - Faster progress to the impression procedure - No sutures required
Q. What are the major mineral salts responsible for the cellular osmotic regulation? The main ions that act in the regulation of the osmotic pressure in tissues and cells are t
Many definitions of species have been offered, but none of them proved to be satisfactory. The definitions did not categorically provide the basis to decide whether two similar gro
Which of the below is usually referred to as "master gland" because it regulates so many body activities? Is it: a) Pituitary gland b) Thyroid gland c) Adrenal gland d
Q. Are protozoans presenting pulsatile or contractile vacuoles easily found in fresh or in salt water? Fresh water is the less concentrated of solutes than sea water and it fre
Explain Membrane Filtration Technique? Another method used for determining the bacterial number is the filtration technique. The margain figure illustrates the membrane filter
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