Hormones of the Human Body
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The nervous system gives instant reactions because nerve signals are passed on by electrical impulses and take only seconds to be transmitted from one end of the body to the other so reactions are almost instantaneous with the stimulus, and are of short duration and localized (Applegate, 2000, 205). Endocrine reactions take longer to have an effect because they depend on a nerve cell passing along a signal to a gland, which then has to emit a chemical transmitter which has to travel through the bloodstream to an effector cell, where it must bind to a specific receptor before it can bring about a change in that cell. Sometimes the chain involves a releasing factor being secreted from the hypothalamus which acts on the anterior pituitary gland which s
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Approximate Word count = 509
Approximate Pages = 2 (250 words per page)
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