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8 Cards in this Set
- Front
- Back
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Hormone |
A chemical substance produced and released by nonneural endocrine cells or by neurons; it exerts regulatory influences on the function of other, distant cells reached via the blood; and it is effective at very low concentrations. |
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Endocrine glands |
Discrete organs that are organized secretory cells that produce hormones, which are secreted into the extracellular fluid. |
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Receptor molecules |
Are on the target cells and specifically bind to a certain hormone. These are necessary for a hormone to know which cell it needs to attach too. |
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Target cell sensitivity |
This depends (is high or low) on the number of functional receptor molecules the target cell expresses for that particular hormone. |
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Concentration of Hormones in the Blood |
This vary's but the moment-to-moment blood conc. of a hormone represents the balance between the rate of addition of hormone to the blood and the rate of removal from the blood |
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Rate of hormone addition |
Is added to blood stream by secretion from endocrine glands. Because removal is pretty constant Hormone conc. in the blood is more dependent on this. |
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Rate of hormone removal |
Is done by metabolic destruction and excretion. Is a constant and so there is even a half-life associated with a hormone. |
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Peripheral activation |
The conversion of some hormones to a more active form after secretion is done by this process. |
