The level of thyroxine in the body is controlled by negative feedback.
The diagram shows how this takes place.
Which numbers on the diagram represent the hormones TSH and thyroxine?
1 )
2 = thyroxine 3 = TSH
2 )
1 = TSH 3 = thyroxine
3 )
3 = TSH 4 = thyroxine
2 = TSH 3 = thyroxine
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