Keywords for Pages 4-11 in textbook

Flashcards for the Key Definitions on pages 4-11 of the A2 OCR Biology Textbook.

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Stimulus
Any change in the environment that causes a response.
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Response
A change in behaviour or physiology as a result of a change in the environment.
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Homeostasis
The maintenance of the internal environment in a constant state despite external changes.
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Negative Feedback
A process that brings about a reversal of any change in conditions. It ensures that an optimum steady state can be maintained, as the internal environment is returned to its original set of conditions after any change. It is essential for homeostasis
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Positive Feedback
A process that increases any changes detected by the receptors. It tends to be harmful and does not lead to homeostasis.
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Ectotherm
An organism that relies on external sources of heat to regulate its body temperature.
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Endotherm
An organism that can use internal sources of heat, such as heat generated from metabolism in the liver, to maintain its body temperature.
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Other cards in this set

Card 2

Front

A change in behaviour or physiology as a result of a change in the environment.

Back

Response

Card 3

Front

The maintenance of the internal environment in a constant state despite external changes.

Back

Preview of the back of card 3

Card 4

Front

A process that brings about a reversal of any change in conditions. It ensures that an optimum steady state can be maintained, as the internal environment is returned to its original set of conditions after any change. It is essential for homeostasis

Back

Preview of the back of card 4

Card 5

Front

A process that increases any changes detected by the receptors. It tends to be harmful and does not lead to homeostasis.

Back

Preview of the back of card 5
View more cards

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