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Homeostasis

Homeostasis is crucial for the regulation and maintenance of the body's internal environment, ensuring conditions like body temperature remain within a narrow range. It involves intricate control systems where sensors gather data, a control center processes the information, and communication systems relay messages to target organs and tissues that respond to changes. Feedback loops play a vital role; negative feedback counteracts changes to maintain stability, while positive feedback accelerates processes such as cell division, exemplified in scenarios like blood clotting and hormonal regulation.

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Homeostasis

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  1. Homeostasis

  2. KEY CONCEPTHomeostasis is the regulation and maintenance of the internal environment of the body

  3. I. HomeostasisConditions within the body must remain within a narrow range – like your body temperature a. Homeostasis involves keeping the internal environment within set ranges

  4. pore sweat glands hair follicle muscle goose bump b. Control systems help maintain homeostasis. • sensors gather data • control center receives data, sends messages • communication system delivers messages to target organs, tissues • targets respond to change

  5. II. Feedback Loops a. Negative feedback loops are necessary for homeostasis • Feedback compares current conditions to set ranges. • Negative feedback stops the change

  6. Holding breath, CO2 levels rise O2 /CO2 level returns to normal Control system forces exhale, inhale b. Negative Feedback Loop Example:

  7. platelets blood vessel fibrin clot white blood cell red blood cell • Example: Torn blood vessel stimulates release of clotting factors c. Positive feedback increases change • growth hormones stimulate cell division

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