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7 Cards in this Set
- Front
- Back
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What is excreted rapidly?
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Catecholamines
peptide hromones |
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What resists excretion?
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Protein bound hromones (steroids)
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Down regulation
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High extracellular concentration of hormone remains for a prolonged time resulting in the target cells decrease in receptors
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Up regulation
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Cell is exposed for a long time a very low concentration of hormone which results in the target cell producing more receptors for that particular hormone.
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Short loop feedback mechanism
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Signalling of hypothalamus is provided by the hormones produced by the anterior pituitary gland.
Insensitive Usually very high concentrations need as a result Happens when target organ (thyroid) is destroyed or not functioning or uptaking anterior pituitary hormones. |
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Long loop feedback mechanisms
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Hormones synthesised in the target organ have an effect on the anterior pituitary (direct) or hypothalamus (indirect)
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Ultra short loop feedback
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hypothalamic releasing hormones act on hypothalamus receptors to inhibit their release.
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