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15 Cards in this Set
- Front
- Back
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How are peptide hormones transported?
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dissolved in plasma
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how are peptide hormones stored?
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in secretory vesicles
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pro hormone
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produce active hormones
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amine hormones are derived from what amino acid?
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tyrosine
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how are thyroid hormones transported?
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transported bound to plasma proteins
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How are catecholamines transported?
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transported dissolved in the plasma
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how are steroid hormones transported?
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transported bound to plasma proteins
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what is the common precursor for all steroid hormones?
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cholesterol
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are steroid hormones stored?
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no, only cholesterol is stored
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how is the rate of secretion of steroid hormones controlled?
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Rate of secretion is controlled entirely by rate of hormone synthesis
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what do hydrophilic hormones bind to?
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specific receptors of the cell membrane
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what do lipophilic hormones bind to?
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cross the membrane and bind to receptors within the cell
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what are the three mechanisms by which hormones elicit their effects on their target cells?
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hydrophilic: 1. alter cell's permeability & activate secondary messenger system
lipophilic: activate specific genes in target cell |
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three common actions of hormones?
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-The actions of hormones are greatly amplified at the target cell
-Hormones regulate the rates of existing reactions instead of initiating new reactions -Hormone action is relatively slow and prolonged |
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what hormone is secreted by the pineal gland? what are its functions?
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MELATONIN!
-hormone of darkness -biological clock -natural sleep -reproductive activity -shuts down ovulation -slow aging via removal of free radicals -enhance immunity |
