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20 Cards in this Set
- Front
- Back
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Secretion by the anterior pituitary is controlled by what?
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Hormones
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Secretion by the posterior pituitary is controlled by what?
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Nerve signals that originate in the hypothalamus and terminate in the posterior pituitary
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How do hormones released from the hypothalamus reach the anterior pituitary?
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Via Hypophysial portal vessels
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Which two hormones are released by the posterior pituitary and under what type of control are they under for their release?
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1) ADH
2) Oxytocin Under neural control from the hypothalamus |
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How do ADH and oxytocin differ?
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Just in two amino acids
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What are the actions of ADH?
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1) Regulates water in the renal tubules via V2 receptor
2) Plays a role in blood pressure regulation via V1 receptor |
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How is ADH regulated?
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Through osmoreceptors that detect the level of osmolality (high ECF will elicit ADH release)
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What does prolactin do?
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Released from the anterior pituitary, it stimulates production of milk proteins.
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What does prolactin inhibit?
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Lutenizing hormone
Follicle Stimulating Hormone |
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Prolactin is under antagonistic dual control of what two things?
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1) Dopamine (PRIH)
2) PRFs |
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T/F Estrogen is a key player in prolactin stimulation
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True
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Where is growth hormone released from?
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Somatotrophs.
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Where does growth hormone act on?
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All tissues
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What does growth hormone absolutely need in order to cause growth?
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1) Insulin
2) Carbohydrate |
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Many GH are also mediated by what?
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somatomedins
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What are some examples of somatomedins?
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Insulin Like Growth Factor -1 (IGF-1)
or Somatomedin C |
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Somatomedins act on target cells the same way as GH does. What is this method of action?
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via membrane tyrosin kinase receptors
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Where is IGF-1 mainly secreted from?
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The liver
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Paracrines affect cells that are ____
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neighboring
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Autocrine act on ____
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the same cells
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