Ch. 6 Endocrine System Notes

Ch. 6 Endocrine System Notes - Ch. 6 The Endocrine System...

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Ch. 6 The Endocrine System Endocrine glands are derived from epithelial tissue 1) Primary Endocrine Glands a Hypothalamus and Pituitary Gland i) The hypothalamus secretes several hormones which affect the pituitary gland, also  called the hypophysis, a pea size structure connected to the hypothalamus by a stalk  called the infundibulum ii) The pituitary is divided into the anterior lobe (the adenohypophysis) and the posterior  lobe (the neurohypophysis) iii) The posterior lobe of the pituitary gland contains neural tissue consisting of the  endings of the neurons originating in the hypothal; these secrete two peptide  hormones,  antidiuretic hormone  (ADH, aka vasopressin) and  oxytocin ; though  they are secreted there, they are generally synthesized in the hypothal, ADH in the  paraventricular nucleus and oxytocin in the supraoptic nucleus iv) The anterior lobe of the pituitary and the cells of the hypothalamus that control is  secrete primarily  tropic hormones , which regulate the secretion of other hormones (1) the hypothalamus secretes hormones into the capillary bed located in  hypothalamic-pituitary portal system, and from there the tropic hormones travel  down the infundibulum to the pituitary gland via a portal vein, from which they  enter a second capillary bed; the tropic hormones then stimulate or inhibit the  release of hormones from the anterior pit. v) Compared to the posterior lobe, the anterior lobe is more typical of an endocrine  gland in that hormones are synthesized and secreted on site vi) Know these! (1) prolactin releasing hormone  (PRH) – stimulates the anterior pituitary to release  prolactin which stimulates mammary gland development in females (2) prolactin inhibiting hormone  (PIH)  - aka dopamine, inhibits the release of  prolactin
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(3) thyrotropin releasing hormone
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This note was uploaded on 04/07/2008 for the course APK 2105 taught by Professor Brooks during the Spring '07 term at University of Florida.

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Ch. 6 Endocrine System Notes - Ch. 6 The Endocrine System...

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