27homeostasis (1) - Lecture 27: Homeostasis Chapter 10:...

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Lecture 27: Homeostasis Chapter 10: Homeostasis
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The Big Picture What is homeostasis ? Negative Feedback Positive Feedback
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Homeostasis Human bodies need to remain at a fairly constant level to stay alive Even though our external environment fluctuates
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Homeostasis We have many organ systems in place to maintain our preferred state We have many ways to “maintain homeostasis”
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Daily Cycles Throughout the day, levels fluctuate regularly within certain narrow limits E.g. glucose in blood stream raises after meals, body temperature raises after waking and lowers when returning to sleep
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Body Systems 2 main organ systems important for maintaining homeostasis Nervous System Endocrine System
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Nervous System Brain, spinal cord, and nerves coordinate activities of all other body organ systems Electrical signals detect changes to environment and cause the body to react
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Endocrine System Pancreas and thyroid glands release hormone chemical messengers Chemical signals detect changes to environment and cause the body to react
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27homeostasis (1) - Lecture 27: Homeostasis Chapter 10:...

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