sheath. A many-layered white‚ lipid and protein covering produced by the neuroglia that is called the myelin sheath surround the axons of most neurons. The sheath electrically insulates the axon of a neuron and increases the speed of nerve impulse conduction. Axons with such a covering are said to be myelinated whereas those without it are said to be unmyelinated. Two types of neuroglia produce myelin sheaths: neurolemmocytes and oligodendrocytes. In the PNS‚ neurolemmocytes form myelin sheaths
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ANATOMY AND PHYSIOLOGY OF THE HEART Anatomy: The heart and heart wall layers: The heart is located in the left side of the mediastinum; it consists of three muscle layers the Endocardium‚ myocardium‚ and epicardium. The epicardium is the outermost layer of the heart. The myocardium is the idle layer of and actual contracting muscle of the heart. The endocardium is the innermost layer and lines the inner chambers and heart valves. Pericardial sac: The pericardial sac encases and protects
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Text C is part of a guide which is intended to inform the reader about how people in the workplace should act appropriately‚ particularly in terms of how members of the opposite sex should talk to each other. The text also reveals some issues concerning both language and gender; these are going to be explored. The first thing to be considered is the graphology of the text. The police force’s logo being displayed on the right side of the page makes it seem to be of less importance‚ while increasing
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action potential generated by ventricular myocytes _H__ functions as the pacemaker of the whole heart _D__ calcium _C__ Bachmann’s bundle _A__ Bundle of His _B__ action potential generated by pacemakers Prof. Beyenbach VRT 8014 A. ventricular conduction system that distributes the action potential arriving at the AV node B. slow response action potential C. mediates the atrial action potential from right to left atrium. D. primary mediator of excitation-contraction coupling E. eliminate the need
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This is a homeostatic control system. In the negative feedback mechanism (refer to model 1)‚ a change is detected which activates mechanisms to reverse the change. In the context of Thermoregulation‚ whenever the internal temperature of the cyclist deviates from what is considered normal (approximately 37 degrees celsius)‚ ie
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connections for a quick coordination. The endocrine system provides chemical integration through hormones. In this chapter‚ you will learn about the neural system of human‚ mechanisms of neural coordination like transmission of nerve impulse‚ impulse conduction across a synapse and the physiology of reflex action. 316 BIOLOGY 21.1 NEURAL SYSTEM The neural system of all animals is composed of highly specialised cells called neurons which can detect‚ receive and transmit different kinds
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down the nerve will then be calculated to determine the nerve conduction velocity. Lastly‚ the temperature sensitivity of nerve conduction velocity will be tested by measuring the speed at which the compound action potential travels down the nerve at both hot and cold temperatures. It was hypothesized that threshold voltage‚ maximal CAP amplitude‚ refractory period‚ nerve conduction velocity and temperature sensitivity of nerve conduction velocity would be
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fiber or axon and that facilitates the transmission of nerve impulses‚ formed from the cell membrane of the Schwann cell in the peripheral nervous system and from oligodendroglia cells. Myelin sheaths three main functions include are protection of the nerve fiber‚ insulation of the nerve fiber and increasing the rate of conduction of nerve impulses. Dendrites Dendrites are a short branched extension of a nerve cell‚ along which impulses received from other cells at synapses are transmitted to the
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classified as occurring by heat conduction‚ also called diffusion‚ of two objects in contact; fluid convection‚ which is the mixing of hot and cold fluid regions; or thermal radiation‚ the transmission of electromagnetic radiation described by black body theory. Engineers also consider the transfer of mass of differing chemical species‚ either cold or hot‚ to achieve heat transfer. II. THREE MODES OF HEAT TRANSFER 1. Conduction In heat transfer‚ conduction (or heat conduction) is the transfer of thermal
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____________________________________ EXERCISE LAB TIME/DATE _______________________ Conduction System of the Heart and Electrocardiography The Intrinsic Conduction System 1. List the elements of the intrinsic conduction system in order‚ starting from the SA node. SA node → AV node → AV bundle (bundle of His) → → Purkinje fibers left and right bundle branches At what structure in the transmission sequence is the impulse temporarily delayed? AV node Why? Allows completion of atrial contraction before
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