Homeostasis Body Sys 09

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Presentation that discusses the concepts of BSCS AHA E231-E236 Careful Coordination

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Homeostasis Body Sys 09

  1. 1. Homeostasis and Body Systems<br />Biology 2009<br />
  2. 2. Role of the Nervous System<br />The nervous system is very important in maintaining homeostasis within our bodies.<br />The nervous system regulates:<br />Automatic Responses<br />Ex = shivering when cold<br />Voluntary Responses<br />Ex = putting on a sweater<br />
  3. 3. The Brain is the Nervous System Control Center<br />Different parts of the brain control different nervous<br />system responses:<br />Receive and transmit information<br />Regulate physiological processes like <br />water balance<br />body temperature<br />hunger<br />sleep<br />
  4. 4. The Brain also helps to regulate the Endocrine System<br />The Endocrine System is made of glands and <br />cells that produce and release chemical <br />messages in the form of HORMONES.<br />Hormones stimulate processes that help <br />maintain homeostasis.<br />
  5. 5. Hormones Transported in Blood<br />Hormones are chemicals<br />Control balance of sugar absorption by cells, water balance in body, and much more<br />Moved within blood stream past every part of body<br />Recognized only by “Target Cells” with special receptor proteins that can interact with the hormones (like a lock & key)<br />
  6. 6. Example of Hormone Function<br />Dehydration:<br />Sensor cells in brain detect water shortage because body has higher sodium concentration when water concentration is low .<br />Brain cells signal for production and release of hormones (ex. Vasopressin) which are carried in the blood throughout the body. <br />
  7. 7. Example of Hormone Function cont…<br />Target cells that have certain receptors for this hormone (kidney cells) receive hormone message.<br />Message signals cell membranes of kidney tubule cells to become more permeable to water.<br />More water is reabsorbed by circulatory system and kept within body.<br />Prevents excess water from being released in urine and restores the water balance.<br />
  8. 8. Feedback Systems<br />Groups of body systems that work together to maintain homeostasis in the body.<br />Regulates body responses to changing conditions outside and inside the body.<br />Can be POSITIVE or NEGATIVE<br />
  9. 9. Negative Feedback<br />Body detects change<br />Body systems attempt to correct the abnormal situation<br />
  10. 10. Positive Feedback Example<br />
  11. 11. Positive Feedback<br />Quick response that amplifies the change (instead of “correcting it” in negative feedback)<br />
  12. 12. The End<br />

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