The specific target cells of the thyroid hormones, thyroxine and triiodothyronine are all the cells of the body.
Triiodothyronine is a thyroid hormone also abbreviated as T₃. It plays its role in various functions of the body like growth and development, metabolism, body temperature, and heart rate. The hormone is produced by the action of another hormone called Thyroid Stimulating Hormone (TSH). The effect of T₃ on the cells is four time more than that of T₄.
Thyroxine is also a thyroid hormone, abbreviated as T₄. It is secreted into the bloodstream by thyroid gland. However, this form of hormone is considered as the inactive form and T₃ is considered to be active.
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