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(T₃), which is the active hormone that stimulates metabolism. About 80% of this conversion is in the liver and other organs, and 20% in the thyroid itself.

TSH is secreted throughout life but particularly reaches high levels during the periods of rapid growth and development, as well as in response to stress.

The hypothalamus, in the base of the brain, produces thyrotropin-releasing hormone (TRH). TRH stimulates the anterior

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