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Homeostasis Regulation Maintained Through Feedback Loops
- 1. Section 28-2 “Homeostasis” Write everything that is underlined
- 2. 28.2 Mechanisms of Homeostasis KEY CONCEPT Homeostasis is the regulation and maintenance of the internal environment of the body
- 3. 28.2 Mechanisms of Homeostasis I. Homeostasis Conditions within the body must remain within a narrow range – like your body temperature a. Homeostasis involves keeping the internal environment within set ranges
- 4. 28.2 Mechanisms of Homeostasis 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 pore sweat glands hair follicle muscle goose bump
- 5. 28.2 Mechanisms of Homeostasis II. Feedback Loops a. Negative feedback loops are necessary for homeostasis • Feedback compares current conditions to set ranges. • Negative feedback stops the change
- 6. 28.2 Mechanisms of Homeostasis b. Negative Feedback Loop Example: Holding breath, CO2 levels rise Control system forces exhale, inhale O2 / CO2 level returns to normal
- 7. 28.2 Mechanisms of Homeostasis c. Positive feedback increases change –Example: Torn blood vessel stimulates release of clotting factors –growth hormones stimulate cell division platelets fibrin white blood cell red blood cell blood vessel clot