Powerpoint endocrine system

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Powerpoint endocrine system

  1. 1. ENDOCRINE SYSTEM<br />
  2. 2.
  3. 3. HORMONE<br />Is a chemical substance, produced by a gland, carried by the blood, which alters the activity of one or more specific target organs and is then destroyed by the liver<br />
  4. 4. Endocrineglands<br />
  5. 5. ADRENALINE<br />
  6. 6. Hormone: adrenaline<br />
  7. 7. Adrenaline<br />The “fightorfright” hormone.<br /><ul><li>Itisreleased in stress-fulsituations
  8. 8. Alltheeffectsmakeus more abletoreactquickly and vigorously in dangeroussituationsthatmightrequireustorunawayorput up a struggle.
  9. 9. Increasesbloodglucoseconcentration.</li></li></ul><li>Comparingthenervoussystemwiththeendocrinesystem<br />
  10. 10. PANCREAS<br />
  11. 11. 12<br />The glucose concentration in the blood is controlled by the PANCREAS.<br />The pancreas contains cells which produce digestive enzymes but it also contains cells (alpha and beta cells) which produce the hormones insulin and glucagon<br />-If the glucose concentration rises, the beta cells release insulin.<br />-If the glucose concentration falls, the alpha cells release glucagon.<br />-Insulin stimulates the liver and muscles to remove excess glucose from the blood and store it as glycogen<br />-Glucagon stimulates the liver to convert its stored glycogen intoglucose which is then released into the bloodstream.<br />In this way, the concentration of glucose in the blood is kept within narrow limits<br />
  12. 12. NEGATIVE FEEDBACK<br />Is a system of control in which the outgoing impulses counteract the effects which produced the incoming impulses.<br />

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