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Endocrine System

Endocrine System. Chemical Control: similar to nervous control, coordinate body processes by transmitting messages from one part of the body to another Achieved through hormonal action. Endocrine System. Function: to maintain homeostasis

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Endocrine System

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  1. Endocrine System Chemical Control: similar to nervous control, coordinate body processes by transmitting messages from one part of the body to another Achieved through hormonal action

  2. Endocrine System • Function: to maintain homeostasis • Endocrine glands: synthesize and secrete hormones (ductless) • Hormones ≡ chemicals secreted in one area of body which affect responses in other areas. • The circulatory system aids in the distribution of these hormones • Delivered to target tissue which recognize specific hormones by receptor cells • Hormones have specific shape that fit the receptors

  3. Regulation • How we maintain homeostasis • nervous system • nerve signals control body functions (faster & short-lasting) • endocrine system • hormones • chemical signals control body functions (slower & longer-lasting)

  4. Hormones • Why are hormones needed? • chemical messages from one body part to cells in other areas of body • communication needed to coordinate whole body • maintaining homeostasis growth hormones

  5. Endocrine System • Endocrine system releases hormones • glands which secrete (release) chemical signals into blood • chemicals cause changes in other areas of body • growth hormones • sex hormones • response hormones • metabolism hormones • and more….

  6. Responding to hormones • Lock and key system • hormone fits receptor on “target” cell targetcell secretingcell non-targetcells can’treadsignal can’treadsignal

  7. Control of the Endocrine system • The hypothalamus integrates endocrine and nervous function • Nervous tissue; part of the mid-brain

  8. high low Maintaining homeostasis hormone 1 Feedback lowersbody condition gland specific body condition raisesbody condition gland hormone 2

  9. high Negative Feedback • Response to changed body condition • if body is high or low from normal level a signal tells body to make changes that will bring body back to normal level • once body is back to normal level, signal is turned off hormone 1 lowersbody condition gland specific body condition

  10. pancreas high liver low pancreas liver Regulation of Blood Sugar Feedback insulin body cells takeup sugar from blood liver storessugar reducesappetite blood sugar level (90mg/100ml) liver releasessugar triggershunger Diabetes: insulin deficiency-results in an elevated blood sugar level (glucose) glucagon

  11. Regulation by chemical messengers • Neurotransmitters are released by neurons • Hormones are released by endocrine glands endocrine gland neurotransmitter axon hormone carried by blood receptor proteins receptor proteins target cell

  12. hormones hormones Body Regulation • Nervous system & Endocrine system work together • hypothalamus • “master nerve control center” • receives information from nerves around body about internal conditions

  13. hormones hormones Body Regulation • Nervous system & Endocrine system work together • hypothalamus ‘talks’ with pituitary gland • “master gland” • releases many hormones • sexual development, growth, milk production, pain relief

  14. Nervous vs. Endocrine Systems • Nervous system • Endocrine System

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