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Endocrinology (from Greek ἔνδον, endo, "within"; κρῑνω, krīnō, "to separate"; and -λογία, -logia) is a branch of biology and medicine dealing with the endocrine system, its diseases, and its specific secretions called hormones, the integration of developmental events such as proliferation, growth, and differentiation (including histogenesis and organogenesis) and the coordination of metabolism, respiration, excretion, movement, reproduction, and sensory perception depend on chemical cues, substances synthesized and secreted by specialized cells.

Endocrinology is concerned with the study of the biosynthesis, storage, chemistry, Physiological function of hormones and Pathology with the cells of the endocrine glands and tissues that secrete them.

The endocrine system consists of several glands, all and in different parts of the body, that secrete hormones directly into the blood rather than into a duct system. Hormones have many different functions and modes of action; one hormone may have several effects on different target organs, and, conversely, one target organ may be affected by more than one hormone.

In the original 1902 definition by Bayliss and Starling (see below), they specified that, to be classified as a hormone, a chemical must be produced by an organ, be released (in small amounts) into the blood, and be transported by the blood to a distant organ to exert its specific function. This definition holds for most "classical" hormones, but there are also paracrine mechanisms (chemical communication between cells within a tissue or organ), autocrine signals (a chemical that acts on the same cell), and intracrine signals (a chemical that acts within the same cell). A neuroendocrine signal is a "classical" hormone that is released into the blood by a neurosecretory neuron (see article on neuroendocrinology).

Hormones act by binding to specific receptors in the target organ. As Baulieu notes, a receptor has at least two basic constituents:

Between these is a "transduction mechanism" in which hormone binding induces allosteric modification that, in turn, produces the appropriate response.

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Matching Endocrinology Colleges

University of California-Berkeley
Four or more years; Public; $34,098 average out-state tuition; $11,220 average in-state tuition
University of Wisconsin-Madison
Four or more years; Public; $24,342 average out-state tuition; $8,592 average in-state tuition
University of the District of Columbia
Four or more years; Public; $13,380 average out-state tuition; $6,380 average in-state tuition

Endocrinology Scholarships

Name Amount Deadline
Monsanto STEM Fellowship Up to $50,000 May 01, 2017
Monsanto Graduate Student Scholarship Up to $25,000 May 01, 2017
FIRST Scholarship - University of Advancing Technology $10,000 May 24, 2017
BCBSM Foundation Student Award Program $3,000 April 30, 2017
Frederick K. Kilian Memorial Scholarship $2,625 April 28, 2017
Dean of Science Scholarship for Continuing Students - IUPUI Up to $2,500 May 15, 2017
Dean of Science Scholarship - IUPUI Up to $2,000 May 15, 2017
Novus Biologicals Scholarship $1,500 July 17, 2017
NDIA William Kauf Memorial Scholarship $1,000 May 31, 2017
Riley Thomas Greer Scholarship $1,000 June 01, 2017