biol 2160-exam 2

biol 2160-exam 2 - Chapter 6-Endocrine System: fig. 6.1...

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Chapter 6-Endocrine System : fig. 6.1 Endocrine Functions- A single gland may produce multiple hormones. EX. Anterior pituitary A single hormone may be made by more than one gland EX. Somatostatin (stomach, pancreas and hypothalamus) A hormone may have more than 1 target & response EX. Testosterone-has multiple effect son different organs Some organs may be exclusively hormonal EX. Anterior pituitary Some organs produce hormones & have other functions EX. Testes produce testosterone and sperm I. Primary Endocrine Organs : Hypothalamus and pituitary gland; Pineal gland; Thyroid gland and parathyroid glands; Thymus; Adrenal glands; Pancreas; Gonads Hypothalamus and Pituitary Gland Hypothalamus in brain -included as part of the nervous system Pituitary gland Anterior lobe -both have 2 different origins and the way that they produce and release hormones Posterior lobe Infundibulum -stalk Hypothalamus and pituitary gland-fig. 6.2 Hormones of Posterior Pituitary-fig. 6.3 Antidiuretic Hormone (ADH or vasopressin): function: Water balance and osmolarity, target kidney Oxytocin- milk ejection, partuition-stressed, “love” hormone; origin posterior pituitary gland of hypothalamus, target breast and uterine to stimulate labor contractions-only for females, pitison given to reverse contractions if they’re too early-manmade; evidence that oxytocin in women because it helps women talk about their problems and men deal with their problems through aggression Hypothalamus to portal to anterior pituitary-releasing or inhibiting Blood Connection to Anterior Pituitary-fig. 6.4 Portal vessel -link 2 capillary beds, in capillaries is where exchange occurs between blood and tissue, found in liver, kidney and anterior pituitary ONLY!!! Target: anterior pituitary Tropic Hormones -Affect release of another hormone, hormones coming form hypothalamus into portal circulation Releasing hormones Inhibiting hormones Common Tropic Hormone Pathway Hypothalamus secretes releasing or inhibiting hormone into capillary bed Blood with tropic hormones enters portal vein Hypothalamic tropic hormones access anterior pituitary secretory cells through capillary beds Alter release of anterior pituitary tropic hormones Anterior pituitary tropic hormones enter bloodstream in same capillary bed Travel to distant endocrine gland to trigger release of hormone Anterior Pituitary Hormones Hormone Target Action Prolactin breast milk production ACTH adrenal cortex release corticoids GH bones and muscles growth in length TSH thyroid gland release T3 and T4 LH leydig cell make testerone LH ♀ follicle ovulation FSH ♂-male testes spermatogenesis FSH ♀-female ovaries maturation of ova --FSH is produced monthly for females -tropic hormones of hypothalamus and anterior pituitary-fig. 6.5
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Control of Hypothalamic Tropic Hormone Release Neural input Hormonal - negative feedback Circadian rhythm
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This note was uploaded on 06/25/2008 for the course BIOL 2160 taught by Professor Kt during the Spring '08 term at LSU.

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biol 2160-exam 2 - Chapter 6-Endocrine System: fig. 6.1...

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