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12 Cards in this Set
- Front
- Back
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Autotroph |
Can make organic molecule(s) from inorganic molecule(s) |
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Heterotroph |
Relies on organic molecules (that have been made by another organism) |
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Homeostasis |
1 Idea of maintaining (relatively) stable internal environment/state 2 within (narrow) range about a set point 3 even though environment is changing |
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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 |
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Positive feedback |
A process that increases any change detected by the receptors. It tends to be harmful and does not lead to homeostasis |
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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 hormones into a duct that carries the molecules to where they are used |
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Hormone |
Molecules released by the endocrine glands directly into the blood. They act as messengers, carrying a signal from the endocrine glands to a specific target organ or tissue |
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Target tissue |
Tissues containing cells that have a specific receptor on their plasma membrane. The shape of the receptor is complementary to the shape if the hormone molecule |
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Excretion |
The removal of metabolic waste from the body |
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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 |
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Respiratory substrate |
An organic substrate that can be used for respiration |
