ths general biology unit 3 cell processes homeostasis and feedback mechanisms notes_v1516
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BiologyUnit 3 Notes:Homeostasis &
Feedback Mechanisms
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(1) Homeostasis•Homeostasis: Maintaining internal balance / stability.
•When something causes the environment inside your cells to change, there are chemical processes in place to bring the cells back to their “normal” state.
• These “Chemical Processes” are involuntary and called “Feedback Mechanisms”.
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(2) Basic Homeostatic Response
“Homeostasis is a delicate balancing act.”
1. Starts with a stimulus (something that causes the change).2. A receptor (nerves) in your body detects the change.3. A nerve message is sent to the nervous system.4. A nerve message is sent out of the nervous system back to the body
part.5. The body part does something to regain its “normal” state.
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(3) Negative Feedback Mechanisms
•Negative Feedback Mechanisms: Chemical processes that return your body back to its “normal” state.
•Most homeostatic responses are regulated by Negative Feedback Mechanisms.
• Examples: •Body Temperature (Shivering & Sweating)•Blood Sugar Levels (Insulin)
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(4) Positive Feedback Mechanisms
•Positive Feedback Mechanisms: Chemical processes that cause more change to happen.
•Very few homeostatic responses are Positive Feedback Mechanisms.
• Examples:•Childbirth (Oxytocin & Contractions)•Blood Clotting (Platelets & Chemicals)
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