January 30‚ 2014 Nervous Tissue ! Anatomy & Physiology - Overall Purpose of the Nervous System ! • To keep controlled conditions within limits that maintain life health and homeostasis ! - Regulates body activities by responding via nerve impulses‚ works with the endocrine system which responds by releasing hormones ! • Responsible for our behavior‚ memories‚ and movements ! • Neurology : branch of medicine that deals with normal functioning and disorders of the nervous system !
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spinal cord‚ and nerves. These organs mostly consist of Nervous Tissues. http://www.nlm.nih.gov/medlineplus/ency/images/ency/fullsize/19588.jpg Nervous Tissues Nervous tissues are made up of two main types of cells: nerve cells/neurons and neuroglia. The main functions of nervous tissues are to react to stimuli and generate impulses to various organs in the body. http://www.occc.edu/deanderson/dennis-tutorial/dennis-jpeg/Nervous%20Tissue-low%20mag%20D-1%20copy Nerve cells and Neuroglia
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initiated by sinoatrial node inside the heart itself‚ not by nerve impulses from the central nervous system. After exercise‚ the concentration of carbon dioxide in the blood is high‚ meaning that the pH in the blood is low. Chemoreceptors in the carotid arteries and aortic walls detect this change in pH. They increase the frequency of nerve impulses to the centre in the medulla oblongata. The centre increases the frequency of impulses via the sympathetic nervous
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It was first discovered and isolated in 1940s‚ but its molecular structure was determined only a few years later. Antimycin is a mitochondrial inhibitor which is involved in the energy-coupling site of the respiratory system. Antimycin A works by inhibiting the flow of electrons between cytochrome b and cytochrome C1. It was first discovered as an effective fungicide which inhibited fungal growth‚ while most of the bacteria were unaffected. Because of such properties‚ antimycin was of great interest
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hamburger encounters the olfactory cilia‚ located in the supporting olfactory epithelium. The cilia pass along the impulse of the odor thru the olfactory cell‚ then further onto the axon bundle‚ before passing through the cribriform plate. Upon leaving that boney structure‚ the signal hops a ride on the olfactory bulb. The bulb in turn feeds impulses on to the olfactory nerve. This nerve enters the brain and will cause the subject to understand the odor to be hamburger‚ of which he wants to eat. The
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this range‚ there is a system in body called the negative feedback system‚ which is where the systems attempt a normal body temperature. When temperatures go outside of this range in a particular place in the body‚ a stimulus to a receptor sends nerve impulses to a regulating centre in the brain. The brain sends an effector to the spot to
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Presentation Questions Ecstasy 1. Explain how the brain normally regulates serotonin. How does ecstasy act in the brain‚ & what neurotransmitters does it affect? - Normally‚ the brain regulates serotonin (5-HT) by taking up the release in neighboring neurons. - With ecstasy‚ the neuron is still supplied with 5-HT directly. However‚ ecstasy MIMICS 5-HT by blocking the reuptake of serotonin‚ [causing the release of high levels of 5-HT into the synapse]‚ which induces euphoria & the
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3 parts of a nerve cell a. Dendrites b. Cell Body c. Axon 2. Types of nerves: a. Afferent Neurons=sensory‚ conduct impulses TO the brain b. Efferent Neurons=motor‚ conduct impulses AWAY from the brain c. Interneurons 3. Types of Cells in the CNS: a. Astrocytes b. Microglia c. Oligodendrocytes-form myelin sheath of CNS d. Schwann Cells-form myelin sheath of PNS 4. White matter vs. Gray matter 5. Myelin and its function 6. Nodes of Ranvier 7. Ganglion-clump of nerve cell bodies in
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Kevin L.Gyoerkoe‚ Psy.D‚ and Pamela S. Wiegartz’ ‚Ph.D‚ article on “Nerves no more! Help and hope for your nerves” (2008) discusses possible ways of coping with generalized anxiety disorder by focusing on cognitive behavioural therapy (CBT). The authors focus on relaying knowledge to those who are suffering from these specific disorders‚ and target those who could benefit from use of these coping techniques.This article focuses on ways to eliminate anxiety‚ stress‚ and worry through CBT. Gyoerkoe
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into electrical nerve impulses. Structure of sensory receptors Dendrites of sensory neurons divided into: a) free nerve enedings-bare dencdrites thermal‚ pain etc. b) encapsulated nerve endings-dendrites enclosed in layer of connective tissue e.g. pressure. Specialised cells that monitor changes in the internal or external environment and synapse with sensory neuron‚ e.g. vision‚ hearing and taste. Neurons Conduct nerve impulses from one part of
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