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The page below is a sample from the LabCE course Pituitary Hormones. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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Thyroid - Pituitary Feedback Mechanism

A well-understood and classic negative feedback loop is shown between the pituitary and thyroid gland, in which:
1) TSH stimulates the production of T4 and T3, the primary thyroid hormones
2) Adequate levels of T4 and T3 provide negative feedback to the pituitary to stop secreting TSH