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) In general, water-soluble hormones have __________ half-lives in the blood.
(2) The receptors for the following hormones are G protein-coupled receptors (GPCR).
(3) The receptors for the following hormones are G protein-coupled receptors (GPCR).
(4) The receptor for this hormone belongs to the family of receptor tyrosine kinases (RTKs).
(5) The receptors for these hormones are related to cytokine receptors, and are linked to the Janus kinase (JAK) family of tyrosine kinases.