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 active form of vitamin D acts on the following target tissues/organs:
(2) In the kidneys, this enzyme leads to the formation of the active form of vitamin D:
(3) In the kidneys, this enzyme leads to the formation of the inactive form of vitamin D:
(4) Another name for the active form of vitamin D (1,25-dihydroxy vitamin D) is:
(5) This hormone is synthesized and secreted by beta (β) cells (also referred to as B cells) within the islets of Langerhans of the endocrine pancreas.