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Chemical Coordination and Integration
Question
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When thyroxine has positive feed back effect ?

Answer

When the amount of thyroxine level falls below normal, it exerts postive feed back effect on hypothalamus which is stimulated and secretes TSH(thyroid stimulating hormone). It stimulates the anterior lobe of pituitary gland to secrete TSH ,which in turn makes the thyroid gland to secrete T4.

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