Labels:text | screenshot | black and white | black | document OCR: tive The thyroid gland produces two major thyroid hormones, thyroxine (T4) and these triiodothyronine (T3). The production o il by hormones within the thyroid is regulate one; TSH), thyrotrophin (thyroid-stimulating horn tuitary (Fig.a glycoprotein secreted by the anterior p of TSH are 15.1), In turn, the production and releas mone controlled by thyrotrophin-releasing ho sed from (TRH), a tripeptide synthesised and rele es are also the hypothalamus. Higher cerebral centr on. known to influence hypothalamic func gative Circulating levels of T4 and T3 exert a ne pituitary feedback effect on TSH secretion via the h levels of and also the hypothalamus, whereby his T4 or T3 T4 or T3 suppress TSH, and low levels o timulate secretion
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