branched dendrites and a long axon. -The axon is insulated by a fatty material called a myelin sheath. It needs insulation because ‘electricity’ goes through it. -The cell body is found midway along the long axon. -The direction of movement of the impulse is always from the sense organ to the CNS. Motor neurones: -The dendrites of a motor neuron are connected to the cell body at one end of the nerve cell (which is connected to the CNS) -The long axon (insulated too by myelin sheath)
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means an illness that occurs when the body tissues are attacked by its own immune system. In this case they begin attacking nerve cells which communicate with muscles. They attack the myelin sheaths surrounding the axons of the nerve cells. In some cases they have been known to attack the axons themselves. The first known incident of Guillain-Barre syndrome was reported in 1859 by a Frenchman named Jean Baptiste Octave Landry de Thezillat. Landry published a report after analyzing 10 patients with
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can be thought of as an “all-or-nothing” event and occur as a large-scale depolarization when sodium and other positive ions rapidly enter the neuron through membrane channel proteins. Once initiated‚ action potentials travel down the length of the axon and when it reaches the end a neurotransmitter is released into the synapse. Neurotransmitters work differently and some can act to inhibit the neurons while others activate them. After the action potential is complete‚ the neuron must repolarize and
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of the following terms: axons‚ dendrites‚ neurons‚ terminal buttons‚ soma‚ synapse‚ receptor sites‚ neurotransmitter FCA 3: Student’s answers to neurotransmitter scenario questions display evidence of an understanding of the effects of various neurotransmitters by providing a logical choice(s) and appropriate evidence to support that choice. Question: Explain the process of information exchange that occurs in the brain. Be sure to include information on axons‚ dendrites‚ neurons‚ terminal
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located primarily on the ___ ___and ___‚ the receptive and integrative regions of the neuron. Axon hillock‚ action potential The area where the axon emerges from the soma (cell body) is called the ___ ___. This is also where the outgoing signal‚ called a/an ___ ___ is generated. Collaterals‚ terminals An axon can branch‚ forming many axon ___. At the end‚ axons branch to form many axon ___. Schwann cells What support cell forms the myelin sheath? Integral proteins What structures
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responsible for different tasks in the human body.” (K Cherry) Each neuron is a cell that uses biochemical reactions to receive‚ process‚ and transmit information. Neurons communicate by firing‚ or transmitting an electrical impulse along the axon. Sometimes they do not fire. There is no middle ground with neurons‚ either they fire or they do not. A neuron fires when a message arrives at the neutron‚ from then on there is an electrical charge that sends positively charged ions sometimes as high
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Chapter 12: Nervous Tissue - The nervous system includes all nervous tissue in the body -Neural tissue contains two types of cells: 1) neurons (10% of all neurons‚ conduct nerve impulses) 2) neuroglia (support neurons) -We have 100 billion neurons -Organs of the nervous system: brain‚ spinal cord‚ sensory receptors of sense organs (eyes‚ ears‚ etc.)‚ and nerves (connects the nervous system with other systems‚ bundle of neurons that relay information) -Functions of the nervous system: 1) sensory
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The nervous system is one of the most important systems in the body. The nervous system helps to keep the human body in balance. There are several important parts of the nervous system; the brain‚ spinal cord‚ and nerves. Each part of the nervous system has different jobs. There are two main parts of the nervous system peripheral and central. The peripheral nervous system is a collection of peripheral nerves‚ ganglia and specialized sensory structures that‚ as a unit‚ carries sensory and motor information
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complex‚ non-linear‚ and parallel computer. A neuron consists of the cell body‚ the dendrites‚ and the axon. The body of the cell contains the nucleus of the neuron. Each neuron has a hair-like structure of dendrites around it. They branch out into a tree-like form around the cell body. The dendrites are the principal receptors of the neuron and serve to connect its incoming signals. The axon is the outgoing connection for signals emitted by the neuron. It is a long cylindrical connection that
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the axon. Once the information has arrived at the axon‚ it travels down the length of the axon in the form of an electrical signal known as an action potential. Neurotransmitters are needed to send the information from one neuron to the next. Neurotransmitters are chemical messengers that are released from the axon terminals to cross the synaptic gap and reach the receptor sites of other neurons. 3.) Telondendria are the terminals or branches of an axon that terminates or where the axons split
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