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endocrine system glands that produce hormones hormones fit into cell bodies to turn on or off certain organs or tissues exocrine glands give off chemicals through tubes into organs hypothalamus base of brain; regulates activities of other endocrine glands pituitary "talks" to hyp.; controls chemical & physical activities; skull center thymus regulates development of immune system thyroid in neck; increases metabolism; maintains calcium levels parathyroids 4 behind thyroid; regulates calcium and phosphorus adrenals above kidneys; produces adrenaline; increases hr, bp, bs, br pancreas near stomach; insulin & glucagon; rises & lowers bs levels