A nerve cell‚ also known as a neuron‚ is defined as “Any of the impulse conducting cells that constitute the brain‚ spinal column and nerves‚ consisting of a nucleated cell body with one or more dendrites and a single axon.” (thefreedictionary.com.) the dictionary defines an axon as “the long portion of a neuron that conducts impulses away from the body of the cell. Also called nerve fibre” (thefreedictionary.com) the definition of a dendrite is “also called Dendron. Any of the short branched threadlike
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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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ions causes a reversal in charges‚ with a positive charge now occurring on the interior of the cell and a negative charge on the exterior. The cell is said to be depolarized‚ resulting in an action potential causing the nerve impulse to move along the axon. As depolarization of the membrane proceeds along the nerve‚ a series of reactions start with the opening and closing of ion gates‚ which allow the potassium ions to flow back into the cell and sodium ions to move out of the cell. The nerve becomes
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Exercise 3: Neurophysiology of Nerve Impulses Worksheet Assignment Due: Week 4 Student instructions: Follow the step-by-step instructions for this exercise found in your text and record your answers in the spaces below. Submit this completed document by the assignment due date found in the Syllabus. Please make sure that your answers are typed in RED. Please type your Name and Student ID Number here: Charles Coon 4048223 Eliciting a Nerve Impulse Activity 1: Electrical Stimulation
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the sensation of pain and consist of three major portions which are the dendritic zone‚ the axon and the cell body. The dendritic zone is the most distal segment of the sensory neuron and is composed of an arborization of free nerve endings. These free nerve endings respond to stimulation produced in the tissues in which they lie‚ provoking an impulse that is transmitted centrally along the axon. The axon is a long cylinder of neural cytoplasm encased in a thin sheath‚ the nerve membrane. At its
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branchlike structures that receive messages from other neurons. Soma: the cell body of the neuron responsible for maintaining the life of the cell. Axon: tubelike structure that carries the neural message. Glial cells grey fatty cells that provide support for the neurons to grow on and around‚ deliver nutrients to neurons‚ produce myelin to coat axons‚ clean up waste products and dead neurons‚ influence information processing‚ and‚ during prenatal development‚ influence the generation of new neurons
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the brain: grey matter and white matter. Grey matter receives and stores impulses. Cell bodies of neurons and neuroglia are in the grey matter. White matter in the brain carries impulses to and from grey matter. It consists of the nerve fibers (axons). The brain stem The brain stem is also known as the Medulla oblongata. It is located between the pons and the spinal cord and is only about one inch
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from the neuron and they also receive signals along with sending electrical stimulations to the soma. Synaptic Gap – This is a small gap between the cell membrane and the synapse it separates the neurons and allows the synapse to pass information. Axon – It’s a long slender part of the nerve cell‚ that helps transmit the neural signal. Neurotransmitter – They are brain chemicals that communicate throughout the body. Amygdala – It is located in the cerebral hemisphere that looks like a grey almond
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communication (Martini‚ 375). A neuron is composed of a cell body‚ dendrites and axon (Marieb‚ 376). A nerve is a bundle of axons or dendrites that is wrapped in connective tissues (Martini‚ 376). The nerve transport impulse between the central nervous system and other parts of the body (Martini‚ 376). A Myelin sheath can be found in both nerves and neurons (Martini‚ 383). Myelin is an electrical insulation on the axon that increases the speed at which action potential travels
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parts of a neuron are: a cell body‚ dendrites‚ and an axon. • Cell Body‚ also called soma contains the nucleus‚ which itself has the genetic material in the shape of chromosomes. The nucleus and the soma have no active part in the transportation of the neural signal. Cell body; produce proteins that other parts of the neuron
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