Statistics for A Level Biology - Communication and Homeostasis

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Definition	Keyword	% Correct
The mechanism that reverses a change, bringing the system back to the optimum	Negative feedback	88%
Maintaining a constant internal environment despite changes in external and internal factors	Homeostasis	84%
A cell, tissue or organ that brings about a response	Effector	72%
The mechanism that increases a change, taking the system further away from the optimum	Positive feedback	72%
The part of the brain that coordinates homeostatic reponses	Hypothalamus	69%
An organism that uses heat from metabolic reactions to maintain body temperature	Endotherm	50%
The way in which cells communicate with each other	Cell signalling	19%
Cells/sensory nerve endings that respond to a stimulus in the internal or external environment of an organism and can create action potentials	Sensory receptors	9%
An organism that relies on external sources of heat to maintain body temperature	Ecotherm	6%