depends on length of diff path since it relies on diffusion
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autocrine
cells stimulate themselves/communicate with itself
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endocrine
use bloodstream to communicate with cells all over the body - can be v slow - but can result in whole body effect
7 of 20
neurocrine
exclusively produced by pit. v quick. uses bloodstream
8 of 20
Mechanism of action of hormones (2)
1. hormone binds to receptor on cells which is specific to hormone 2. hormone penetrates the CM and binds to receptor inside cytoplasm/on mito and causes change in function of the cell
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how do we know which mechanism of action?
dependent on nature of the hormone , only lipid soluble hormones can pass thru the CM
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main diff between ant and post pit
ant. pit has endocrine cells , post pit doesnt
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post pit
hormones are secreted straight into blood
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ant pit
involves 2 hormones , 1 to activate the endocrine cells to secrete the 2nd
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which pit secretes neurohormones
post pit
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abbreiv RH
releasing hormone
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SH
stimulating hormone
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post pit secretes
ADH , oxytocin
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deficiency in secretions can lead to
Diabetes incipidus - lack of ADH . Lack of growth hormone - dwarfism
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panhypopituitarism
lack/deficiency of a single hormone
19 of 20
Xs secretion
ie giantism etc
20 of 20
Other cards in this set
Card 2
Front
exocrine
Back
have ducts which are part of a vessel - located near the organ of target
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