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Thyroxine is the main hormone secreted into the bloodstream by the thyroid gland. It plays vital roles in digestion, heart and muscle function, brain development and maintenance of bones. Alternative names for thyroxine T4; tetraiodothyronine; thyroxin.
Thyroid gland is an endocrine gland which secretes two types of hormones, T3 and T4. These hormones are concerned with the regulation of metabolism in human body. The under activity of these hormones results in hypothyroidism while hyperthyroidism, is an outcome of over-activity of T3 and T4 hormones.The levels of T3 and T4 in the body are determined by another hormone called Thyroid Stimulating Hormone (TSH).This hormone is secreted by the pituitary gland.he under activity of these hormones results in hypothyroidism while hyperthyroidism, is an outcome of over-activity of T3 and T4 hormones. The levels of T3 and T4 in the body are determined by another hormone called Thyroid Stimulating Hormone (TSH). This hormone is secreted by the pituitary gland.