The hypothalamus responds to a variety of signals from the internal and external environment including body temperature, hunger, feelings of being full up after eating, blood pressure and levels of hormones in the circulation. to keep the human body in a stable, constant condition. One of the major functions of the hypothalamus is to maintain homeostasis, i.e. In humans, the hypothalamus is approximately the size of a pea and accounts for less than 1% of the weight of the brain. It is an extremely complex part of the brain containing many regions with highly specialised functions. It lies just below the thalamus and above the pituitary gland, to which it is attached by a stalk. The hypothalamus is located on the undersurface of the brain. Computer artwork of a person's head showing the left side of the brain with the hypothalamus highlighted.
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