A Level Biology - Communication and Homeostasis

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Last updated: November 1, 2018

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First submitted	November 1, 2018
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Average score	55.6%
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Definition	Keyword
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
The mechanism that increases a change, taking the system further away from the optimum	Positive feedback
A cell, tissue or organ that brings about a response	Effector
The part of the brain that coordinates homeostatic reponses	Hypothalamus
An organism that relies on external sources of heat to maintain body temperature	Ecotherm

Definition	Keyword
An organism that uses heat from metabolic reactions to maintain body temperature	Endotherm
The mechanism that reverses a change, bringing the system back to the optimum	Negative feedback
Maintaining a constant internal environment despite changes in external and internal factors	Homeostasis
The way in which cells communicate with each other	Cell signalling

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