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Human endocrine system


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Human endocrine system

  1. 1. Human Endocrine System
  2. 2. Endocrine Overview Hormones- chemical messengers travel through body Target cell or organ- organ or cells that a hormone affects
  3. 3. Control of Hormone Release Negative feedback mechanism- hormone release is triggered by stimulus, rising levels of hormone inhibit further release Endocrine stimuli-  Hormonal- hormones stimulate the release of others  Humoral- blood stimulates release of hormones  Neural- nerves stimulate hormone release
  4. 4. Anterior Pituitary Gland Growth Hormone (GH)- affects growth of skeletal muscles and bones Prolactin (PRL)- stimulates milk production after pregnancy Gonadotropic- regulates hormone activity of sex organs Also effects adrenal cortex and thyroid hormone release
  5. 5. Posterior Pituitary Oxytocin- helps during pregnancy Antidiuretic hormone (ADH)- inhibits urine production  Alcohol inhibits ADH causing increased output of urine
  6. 6. Thyroid Gland Thyroid hormone  Controls the rate at which glucose is “burned” Calcitonin  Decreases calcium levels in blood deposits on bone
  7. 7. Parathyroid Gland Parathyroidhormone (PTH)- regulates Ca2+ in blood  If Ca2+ level drops bones is broken down
  8. 8. Adrenal Gland Adrenal Cortex  Releases hormones that regulate mineral content in blood Adrenal Medulla  Produces epinephrine and norepinephrine  Helps with stressful situations
  9. 9. Pancreas Insulin- increases glucose uptake into cells and stores in liver Glucagon- stimulates breakdown of glucose stores in the liver
  10. 10. Pineal Gland Melatonin  Establishes body’s day/ night cycle
  11. 11. Thymus Thymosin  “Programs” T cells
  12. 12. Gonads Androgens (male)- sperm formation, development of male char Estrogens (female)- development of female char