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) Disruption of the pulsatile pattern of hypothalamic secretion of gonadotropin releasing hormone (GnRH) may lead to the following:
(2) Melatonin is produced by the __________ gland.
(3) Dopamine, released by the hypothalamus into the hypothalamo-hypophyseal portal system inhibits prolactin synthesis and release by lactotrophs of the anterior pituitary gland. In this context, dopamine is also referred to as __________.
(4) The site of aldosterone action in the kidneys is:
(5) Aldosterone increases Na+ reabsorption from the lumen of kidney tubules.