Endocrinology is defined as the study of how chemical messenger molecules, referred to as hormones, influence physiological processes. By definition, a hormone is a signaling molecule that is released into the bloodstream, where the hormone can then travel to distant target cells and tissues within the body. Along with the nervous system, the hormones of the endocrine system provide an important means by which information travels within the body. Test your basic knowledge of the endocrine system by taking this simple quiz.
(1) The thyroid hormone receptor exhibits the highest affinity for this thyroid hormone:
(2) The plasma half-life of tetraiodothyronine (T4; also known as thyroxine) is longer than the plasma half-life of triiodothyronine (T3).
(3) The plasma half-life of triiodothyronine (T3) is longer than the plasma half-life of tetraiodothyronine (T4; also known as thyroxine).