OCR Biology A2 Module 1 Definitions

What it says on the tin.

Excuse the spelling mistakes ;)

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 enviroment is returned to its orginal set of conditions after change. It is essential for Homeostatis
Negative feedback
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The maintenance of the internal enviroment in a constant state despite external changes
Homeostatis
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A process that increases any change detected by the receptors. It tends to be harmful and does not lead to homeostais
Positive feedback
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A gland that secretes molecules into a duct that carries the molecules to where they are used.
Exocrine gland
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Molecules ar released by endocrine glands directly into blood. They act as messengers, carrying a signal from the endocrine gland to a specific target organ or tissue.
Hormones
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A gland that secretes hormones directly into the blood. They have no ducts.
Endocrine gland
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The removal of metabolic waste from the body.
Excretion
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Waste substances that may be toxic or are produces in excess by the reactions inside cells.
Metabolic waste
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Organisms that ingest and digest complex organic molecules releasing the potential energy stored in them.
Hetrotrophs
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Organisms that use light energy or chemical energy and inorganic molecules (carbon dioxide and water) to synthesise complex organic molecules.
Autrotroph
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Molecules that absorb light energy. Each absorbs a range of wavelengths in the visable region and has it's own distict peak of absorbtion. Other wavelengths are reflected.
Photosyntheic pigment
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Other cards in this set

Card 2

Front

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

Back

Homeostatis

Card 3

Front

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

Back

Preview of the front of card 3

Card 4

Front

A gland that secretes molecules into a duct that carries the molecules to where they are used.

Back

Preview of the front of card 4

Card 5

Front

Molecules ar released by endocrine glands directly into blood. They act as messengers, carrying a signal from the endocrine gland to a specific target organ or tissue.

Back

Preview of the front of card 5
View more cards

Comments

GemJem

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Good crossword and useful for revision, a couple of spelling mistakes off-putting though.

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