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HOMEOSTASIS & ORGAN SYSTEMS Biology FEEDBACK MECHANISMS Living organisms use biochemical pathways in response to environmental conditions in order to maintain a constant or stable internal environment STEPS TO A FEEDBACK MECHANISM 1. Stimulus Environmental signal 2. Receptor Cell detects change & sends input message 3. Control Center Brain interprets & sends output message 4. Ef fector Cell receives output message 5. Response Behavioral/Chemical change POSITIVE FEEDBACK The product of a process encourages the process NEGATIVE FEEDBACK The product of a process inhibits the process FEEDBACK & HOMEOSTASIS HOMEOSTASIS IN PLANTS Stomata open/close in response to environmental conditions HOMEOSTASIS IN ANIMALS Pancreas secretes insulin/glucagon in response to blood sugar