Thyroid Gland And Thyroid Symptoms
Thyroid gland is a small endocrine organ situated at front and the sides of the neck. It consists of right and left lobes connected by a narrow segment. Endocrine means it produces biologically active substances (hormones) to circulate with the blood and regulate the body processes.
Thyroid gland produces two very important hormones: thyroxine (T4) and 3 iodothyronine (T3). In any age normal level of thyroid gland hormones is necessary for proper functioning of the human body. They influence the body metabolism, tissues growth and development of sexual maturity, menstrual function and ovulation; they stimulate proteine synthesis etc.
The secretion of T4 and T3 is regulated by thyreotropin (TTH), the hormone secreted by hypophyse. The higher level of T3 and T4 in the blood, the lower level of TTH and vice versa by negative feedback. The normal level of TTH in the blood in most cases means that the function of the thyroid gland is normal.
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Source: http://hypothyroidismsymptoms.net)
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