Hormones are chemical messengers produced by the endocrine system that serve as chemical messengers throughout the body. Hormones regulate the body’s processes, like hunger, reproduction, and sexual desire, by communicating with their target cell(s).<\/p>\n\n\n\n
Hormones are the body\u2019s chemical messengers, travelling through the bloodstream to tissues and organs to transmit various signals. Produced by the endocrine system, hormones play a number of crucial roles in the body, and have a direct impact on development and growth, metabolism, sexual function, and cognitive abilities.<\/p>\n\n\n\n
Hormones are secreted directly into the body through endocrine glands, such as the pituitary gland, the pineal gland, and the thymus gland (among others). Reproductive hormones include testosterone<\/a>, estrogen, androgen<\/a>, and progesterone<\/a>. In males, these hormones are produced in the testes, while in females they develop in the ovaries. Reproduction in all sexes also involves follicle-stimulating hormone (FSH)<\/a> and luteinizing hormone (LH)<\/a>, both of which are produced in the pituitary gland.<\/p>\n\n\n\n It\u2019s uncommon, but possible, for male-factor infertility<\/a> to be caused by a hormonal deficiency. LH and FSH are responsible for producing sperm and testosterone in the testes. Low testosterone levels, also known as \u201chypogonadism\u201d does not usually cause infertility<\/a>, but can lead to a reduced sex drive or problems sustaining an erection. Patients with lower levels of testosterone can typically still conceive, but imbalances in FSH or LH can affect sperm production. <\/p>\n\n\n\n German physiologist and zoologist Arnold Adolph Berthold first discovered testosterone in 1849, following an experiment with roosters. He observed that, without testes, male chickens did not develop male characteristics. But when the testes were replaced, the location did not matter \u2014 rather, he concluded, there must be a chemical secreted by the testes that controls this development.<\/p>\n\n\n\n In 1902, William Bayliss<\/a> and Ernest Starling<\/a> made significant contributions of their own in the discovery of hormones when they were studying the nervous system\u2019s impact on the digestive system. The duo concluded that there was a factor secreted from the bloodstream to the intestines that regulated the digestive tract. They named it secretin. It was only until 1905, three years later, that the term \u201chormones\u201d was coined by Starling.<\/p>\n\n\n\n Finally, the work of Charles Darwin and his son Francis \u2014 who studied the movements of plants towards light, \u2014 eventually led to the discovery of the first plant hormone in the 1920s by Frits Warmolt Went. <\/p>\n","protected":false},"author":4,"featured_media":0,"parent":0,"template":"glossary","glossary-cat":[],"class_list":["post-5498","glossary","type-glossary","status-publish","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.givelegacy.com\/vnext\/index.php?rest_route=\/wp\/v2\/glossary\/5498"}],"collection":[{"href":"https:\/\/www.givelegacy.com\/vnext\/index.php?rest_route=\/wp\/v2\/glossary"}],"about":[{"href":"https:\/\/www.givelegacy.com\/vnext\/index.php?rest_route=\/wp\/v2\/types\/glossary"}],"author":[{"embeddable":true,"href":"https:\/\/www.givelegacy.com\/vnext\/index.php?rest_route=\/wp\/v2\/users\/4"}],"version-history":[{"count":1,"href":"https:\/\/www.givelegacy.com\/vnext\/index.php?rest_route=\/wp\/v2\/glossary\/5498\/revisions"}],"predecessor-version":[{"id":17196,"href":"https:\/\/www.givelegacy.com\/vnext\/index.php?rest_route=\/wp\/v2\/glossary\/5498\/revisions\/17196"}],"wp:attachment":[{"href":"https:\/\/www.givelegacy.com\/vnext\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=5498"}],"wp:term":[{"taxonomy":"glossary-cat","embeddable":true,"href":"https:\/\/www.givelegacy.com\/vnext\/index.php?rest_route=%2Fwp%2Fv2%2Fglossary-cat&post=5498"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}Hormones and male fertility<\/strong><\/h2>\n\n\n\n
History of hormones<\/h2>\n\n\n\n