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The Endocrine System Chapter 35.3 Coordination of body systems by Chemical control of hormones I A. Systems that chemically coordinate the body: NERVOUS ENDOCRINE • Stimuli-response • Rapid response • Short time • • • • Stimuli-response Slow response Lasts long time Both=HOMEOSTASIS B.Components of the Endocrine system 1. Glands make ? Hormones or chemical messengers 2. Travel through ? Blood stream (Ductless glands) 3. To where ? Specific Target Organs Pituitary Thyroid Thymus Adrenal Pancreas Ovaries Testes Examples of hormones & glands... • Mammary glands prolactin • Ovaries make estrogen • Testes make testosterone • Adrenal make adrenaline IIA.Hypothalamus: Brain area that controls the Master Gland: Pituitary Also controls oxytocin for uterus contraction & ADH for water balance in the kidneys Pituitary:The Master Gland that controls other endocrine glands Makes • TSH Thyroid hormone for metabolism • LH & FSH for Reproduction • GH Growth hormone • Adrenal hormone Adrenal Medulla makes epinephrine & norepinepthrine • Adrenal gland sits on top of the kidney • Controls “fight or flight” response • Superhuman strength @ adrenaline Pancreas: Regulates sugar balance • Insulin = sugar into cells • Glucagon = sugar leaves the liver Insulin sources for diabetics : • From domestic livestock • Genetically engineered bacteria Feedback thermostat . . . . . .. Feed back loop . . . . . . . High Blood sugar • Pancreas makes insulin • Sugar enters the cells • Blood sugar lowered Low Blood sugar • Pancreas makes glucagon • Sugar leaves the liver • Blood sugar is increased High Blood sugar Glucagon Releases Sugar From liver Low Blood Sugar Cell needs sugar Pancreas makes Insulin = Sugar goes into the cell Thyroid: controls metabolism with thyroxine hormone • Pituitary gland controls the thyroid with TSH • Iodine is important for the thyroid tissue • Goiter results from lack of iodine