the endocrine system chapter 36. endocrine glands

Download The Endocrine System Chapter 36. ENDOCRINE GLANDS

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The Endocrine System Chapter 36 Slide 2 ENDOCRINE GLANDS Slide 3 Slide 4 Slide 5 ENDOCRINE SYSTEM: Set of hormone secreting glands within an animals body ENDOCRINE GLAND: Is a ductless gland that makes & secretes specific chemical messengers (hormones) into the blood Slide 6 EXOCRINE GLAND: Secretes their chemicals into ducts that carry them to their destination eg sweat gland, salivary gland, gastric gland HORMONE: Is a chemical messenger secreted by an endocrine gland into the blood which distributes it through out the body altering the activity of specific target tissues Slide 7 GLANDHORMONEFUNCTION pituitaryADH Anti diuretic hormone Growth hormone Thyroid stimulation hormone TSH Increases H 2 O absorption in the kidney Speeds up growth Causes thyroid gland to secrete thyroxine increasing cell metabolism Slide 8 GLANDHORMONEFUNCTION Pituitary Thyroid Gonad stimulating hormone GSH Thyroxine Stimulates gonads (ovaries & testes) to secrete sex hormones Regulates metabolism, growth & development Slide 9 GLANDHORMONEFUNCTION Adrenal Pineal Pancreas Adrenaline Melatonin insulin Prepares the body for emergency responses Controls body rhythms Regulates the amount of sugar in the blood Slide 10 GLANDHORMONEFUNCTION Thymus Ovaries Testes Parathroids Thymosine Oestrogen & progesterone Testosterone Parathorome Matures WBC Controls sexual development Controls release of Ca from bones into blood plasma Slide 11 Differences between endocrine & nervous systems NERVOUS SYSTEMENDOCRINE SYSTEM Electrical chemical message Chemical message Carried by nervesCarried by blood Impulses target specific sites Messages can be sent to many regions in the body Response is fast acting Response is slow acting Effects are short term Effects are long term Slide 12 Growth Hormone Deficiency Symptoms: Lower than normal height, immature face Excess symptoms: Over enlargement of body tissue including bones in hands, feet, face & skull Corrective measures: (for deficiency) Injections of growth hormone Slide 13 Hormone Supplements know 2 1. Growth hormone can be used as a body building supplement 2. Oestrogen can be used to regulate the menstrual cycle 3. Insulin in the treatment of diabetes 4. HRT hormone replacement therapy to reduce the effects of the menopause Slide 14 Negative feedback control of thyroxine levels HIGHER LEVEL ONLY 1. When the level of thyroxine is LOW, thyroid releasing hormone TRH is produced by the hypothalmus 2. This causes the release of thyroid stimulating hormone TSH in the pituitary 3. TSH stimulates the secretion of thyroxine Slide 15 4. When the amount of thyroxine reaches a certain level, the hypothalmus stops secreting TRH 5. When the level of thyroxine falls again the cycle repeats 6. This is an example of a negative feedback mechanism Slide 16 THYROXINE control Feedback