Abnormal function of the endocrine system may result from a number of different causes. These pathophysiological states of the endocrine system or endocrinopathies may be caused by the absence of hormone, underproduction of hormone, overproduction of hormone, abnormal hormone transport in blood, absence or abnormal function of hormone receptors, or absence or abnormal function of one or more of the cytoplasmic signaling cascades required for normal hormone action. Test your basic knowledge of endocrine pathophysiology by taking this simple quiz.