Key Words: Communication and Homeostasis 0.0 / 5 ? BiologyCommunication and HomeostasisA2/A-levelOCR Created by: natz_16Created on: 30-07-19 17:18 What is a stimulus? A change in the environment that causes a response 1 of 9 What is homeostasis? The maintainence of a constant internal environment in response to external and internal changes 2 of 9 What is cell signalling? Communication between cells. Molecule is released, binds to a recipient cell which causes a change in that cell 3 of 9 What is a receptor? Cell, tissue or organ that detects the stimuli 4 of 9 What is an effector? Cell, tissue or organ that brings about a response 5 of 9 What is negative feedback? response to a change in conditions that acts to reverse that change 6 of 9 What is positive feedback? a small change brings about an increase in that change 7 of 9 What is an ectotherm? Organisms that rely on their surroundings to gain body heat 8 of 9 What is an endotherm? Organisms that generate their own heat 9 of 9
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