F214 Definitions

Negative feedback
A process in which any change in a parameter brings about the reversal of that change so that the parameter is kept fairly constant.
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Positive feedback
A process in which any change in a parameter brings about an increase in that change.
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Homeostasis
The maintenance of the internal environment in a constant state, within narrow limits, despite external changes.
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Endocrine gland
A gland that secretes hormones directly into the blood.
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Exocrine gland
A gland that secretes substances into a duct that carries the substance to where it is used.
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Hormones
Molecules that are released by endocrine glands directly into the blood. They act as chemical messengers, carrying a signal from the endocrine gland to a specific target organ or tissue.
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Target tissue
The target cells are those that possess a specific receptor on their plasma membrane. The shape of the receptor is complementary to the shape of the hormone molecule. Many similar cells together form a tissue.
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First messenger
The hormone that transmits the signal around the body
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Second messenger
cAMP, which transmits a signal inside the cell.
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Excretion
The removal of metabolic waste from the body.
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Autotroph
An organism that can make complex organic molecules from inorganic molecules/CO2.
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Heterotroph
An organism that needs to feed on and digest complex organic molecules.
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Photosynthetic pigment
Molecules that absorb light energy. Each pigment absorbs a range of wavelengths in the visible region and has its own distinct peak of absorption. Other wavelengths are reflected.
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Respiratory substrate
An organic substance that can be used for respiration.
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Other cards in this set

Card 2

Front

A process in which any change in a parameter brings about an increase in that change.

Back

Positive feedback

Card 3

Front

The maintenance of the internal environment in a constant state, within narrow limits, despite external changes.

Back

Preview of the back of card 3

Card 4

Front

A gland that secretes hormones directly into the blood.

Back

Preview of the back of card 4

Card 5

Front

A gland that secretes substances into a duct that carries the substance to where it is used.

Back

Preview of the back of card 5
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