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the layer of fatty material that is usually only surrounds the axon of a neuron. It is made from an electrically insulating substance called myelin and helps to increase the speed by which nerve impulses travel along the nerve.
nerve cells that receive stimuli.
ecotourism that is carried out thoughtfully, morally and in a way that is acceptable to all...
any disease that is caused by a virus or a bacterium or any other micro-organism.
the liquid found in the pleural cavity that acts as a lubricant.
the underground region which is saturated with ground water.