phys endocrine

phys endocrine - Endocrinology- study of cellular...

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Endocrinology - study of cellular communication that is carried out by the endocrine hormones functions: -reproduction -growth & development -maintenance of internal environment -regulation of energy availability -differentiation Characteristics of hormones -secreted by specialized cells/ neurons -ductless glands secrete hormones into bloodstream -interact with receptor proteins to bind -a single hormone can have multiple responses Organ Hormones function Hypothalamus Regulate secretion of anterior pituitary hormones Anterior pituitary gland GH, ACTH, TSH, prolactin, FSH, LH Posterior pituitary gland ADH, oxytocin Pinal gland Melatonin Regulates biological rhythms (day-night cycle) Thymus Chemical classifications 1. steroids = lipids derived from cholesterol *lipophillic = immediately released from the cell following synthesis 2. amine = hormones derived from tyrosine & tryptophan = hormones are chains of amino acids Proteins/ peptide hormones -consist of amino acids -can be synthesized as part of large precursor proteins -stored in membrane-enclosed compartments -hydrophillic -bind to membrane receptors Proteins derived from tyrosine 1. norep. & epi (catecholemines) *not lipophillic *polar cells= require a membrane receptor 2. thyroid hormones (T3, T4) *lipophillic *non-polar= can diffuse into target cells Amplification of signal of regulation in hypothalamus
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phys endocrine - Endocrinology- study of cellular...

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