6529 Lecture Notes - Lecture 2: Thyrotropin-Releasing Hormone, Thyroid, Autocrine Signalling

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Def = study of hormones (chemical messengers released in the blood by glands and bind to cell receptors) and endocrine organs. Indicate important differences between hormonal and neural controls of body functioning. Endocrine = chemical response ; long acting and lasting. Nervous = electrical ; quick acting and short lasting. Basic functions of endocrine system: controls and integrates reproduction, controls growth and development, maintain water and blood nutrient levels, regulates energy and cellular balances, mobilizes stress and defence responses. There are 2 types of glands : exocrine and endocrine. Exocrine > release outside (to membrane surface) non hormonal substances and have ducts. Endocrine > release inside (tissue, blood) hormonal substances and don"t have any ducts. Hormone distributed in blood which binds to distant target cells. Paracrine action (local) hormone acts locally di using from source to neighbour target cells. Autocrine action (local) hormone acts on same cell that produced it.

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