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Homeostasis is the control and upkeep of the body's internal environment to ensure stability. This process involves regulating conditions within a narrow range by utilizing sensors, control centers, and communication systems to maintain balance. Negative feedback loops play a vital role in counteracting changes, while positive feedback loops can amplify responses. This dynamic system helps keep the body functioning optimally.
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KEY CONCEPT Homeostasis is the regulation and maintenance of the internal environment.
Conditions within the body must remain within a narrow range. • Homeostasis involves keeping the internal environment within set ranges.
pore sweat glands hair follicle muscle goose bump • sensors gather data • control center receives data, sends messages • communication system delivers messages to target organs, tissues • targets respond to change • Control systems help maintain homeostasis.
Holding breath, CO2 levels rise, O2 /CO2 level returns to normal Control system forces exhale, inhale Negative feedback loops are necessary for homeostasis. • Feedback compares current conditions to set ranges. • Negative feedback counteracts change. Negative Feedback Loop
platelets blood vessel fibrin clot white blood cell red blood cell • Torn vessel stimulates release of clotting factors • Positive feedback increases change. • growth hormones stimulate cell division
