LSB258 Lecture Notes - Lecture 3: Patellar Reflex, Neuroglia, Myelin

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Lsb258 principles of human physiology the nervous system. The nervous system coordinates the actions of complex organisms via the transmission of electrochemical signals. These signals are transmitted by a specialised network of cells called neurons. Speed in the nervous system is a consequence of action potentials. Start at cell body travel down axon (at 0. 5 130 m. sec-1) Specificity in the nervous system is enabled by synaptic transmission. Nervous system functions to allow us to do simple things like: Nervous tissue two major cells types: neurones - electrically excitable cells/ neuroglia - support neurones. Neuroglia: more prolific than neurones able to proliferate (unlike neurones, most brain tumours. Provide physical support for neurones regulate ionic environment. Line the fluid-filled cavities (ventricles) of cns single layer of cuboidal or columnar-shaped cells cilia which move the fluid inside the ventricles. Neurones: responsible for all nervous system functions, do not proliferate, many shapes and sizes.

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