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ENDOCRINE SYSTEM

ENDOCRINE SYSTEM. VIDEO CLIP. ENDOCRINE V. EXOCRINE. ENDOCRINE. EXOCRINE. “out of” Releases substance into a duct to exit the body. “into” Releases substance (hormone) into the bloodstream. Controlling system of the body; regulates homeostasis Similar to nervous system

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ENDOCRINE SYSTEM

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  1. ENDOCRINE SYSTEM VIDEO CLIP

  2. ENDOCRINE V. EXOCRINE ENDOCRINE EXOCRINE “out of” Releases substance into a duct to exit the body • “into” • Releases substance (hormone) into the bloodstream

  3. Controlling system of the body; regulates homeostasis • Similar to nervous system • Slower than nervous systems; uses chemical messengers released into blood (hormones) • Organs small in size

  4. Examples of major processes controlled by hormones • Reproduction, growth/development, maintenance of electrolyte/water/nutrient balance of blood

  5. HORMONES • Greek: “to arouse” • Def: chemical substances secreted by cells that regulate the activity of other cells. • Circulate in blood • binds to specific receptor (in cell or on cell membrane) and triggers a response

  6. Q: What primarily prompts glands to release their hormones? a. Negative feedback mechanism b. The kidneys c. Nothing; they are continuous d. Secondary responses

  7. Negative feedback mechanisms • Glands are triggered by some stimulus (internal or external) and release hormones. • Then rising hormone levels in the blood are detected by the gland and tell it to quit releasing the hormone

  8. Examples of stimuli that cause an endocrine gland to secrete a hormone 1. Hormonal – a hormone from another gland 2. Humoral– chemical changes in blood 3. Neural – signals from nervous system

  9. Pituitary gland Hypothalamus Pineal gland Thyroid Parathyroid 6. Adrenal gland 7. Thymus 8. Pancreas 9. gonads (ovaries/testes) 10. Placenta Endocrine glands

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