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An Introduction to the Endocrine System

An Introduction to the Endocrine System

An Introduction to the Endocrine System

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Hormone Clearance<br />

• hormone signals must be turned off<br />

when <strong>the</strong>y have served <strong>the</strong>ir purpose<br />

• most hormones are taken up and<br />

degraded by liver and kidney<br />

– excreted in bile or urine<br />

• metabolic clearance rate (MCR)<br />

– rate of hormone removal from <strong>the</strong> blood<br />

– half-life - time required <strong>to</strong> clear 50% of<br />

hormone from <strong>the</strong> blood<br />

– faster <strong>the</strong> MCF, <strong>the</strong> shorter is <strong>the</strong> half-life

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