Homeostasis Body Sys 09
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Homeostasis Body Sys 09

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

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

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Homeostasis Body Sys 09 Homeostasis Body Sys 09 Presentation Transcript

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