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Hormones
endocrine system
13
Biology
9th Grade
05/04/2010

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Term
hormones
Definition
chemical messengers that trigger many of the responses that maintain homeostasis
Term
endocrine glands
Definition
any of the glands of the endocrine system that secrete hormones directly into the bloodstream
Term
target cells
Definition
certain cells equipped to respond to a certain hormone. have chemical receptors that recognize the shape of the molecules on the hormone.
Term
antidiuretic hormone (ADH)
Definition
produced by the hypothalamus; travels to the kidneys where it stimulates nephrons to reabsorb more water...more water is reabsorbed
Term
melatonin
Definition
secreted by pineal gland; helps regulate body's rhythms (contributes to drowsiness)
Term
hypothalamus
Definition
master control center of endocrine system. makes hormones that direct activities of endocrine glands; receives and sends nerve signals
Term
pituitary gland
Definition
secretes hormones that influence other glands/body functions
Term
thyroid
Definition
butterfly-shaped gland wrapped around trachea; produces thyroxine and calcitonin
Term
thyroxine
Definition
stimulates cellular respiration; influences development and maturation; helps maintain normal blood pressure, heart rate, digestion, reproduction.
Term
calcitonin
Definition
a hormone that regulates calcium levels
Term
pancreas
Definition
produces insulin and glucagon
Term
insulin
Definition
increases amount of glucose that enters body cells (decreases blood glucose level). liver stores excess glucose as glycogen
Term
glucagon
Definition
secreted when blood glucose level falls; stimulates liver cells to break down glycogen into glucose, which is then released into the blood
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