Exam II REVIEW ANSWER KEY

Exam II REVIEW ANSWER KEY - Exam II REVIEW ANSWER KEY!...

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Exam II REVIEW ANSWER KEY! Endocrine glands - hormonal secretions directly into bloodstream Exocrine glands - hormonal secretions on the surface or through a duct Hormonal effects: Autocrine -cell produces a factor which binds to its receptor within or on the cell from where it is produced Intracrine – - the factor acts upon the cell that produces it without leaving the cell Paracrine – - factor produced by one cell stimulates adjacent cells or tissues Classifications of hormones Peptide -10 amino acids or less Protein - more than 10 amino acids Glycoprotein - protein hormone with a carbohydrate Alpha subunit – common among hormone Beta subunit – unique for each hormone Steroid - 17 carbon, 4 ring structure Fatty Acid - lipid Steroidogenic Pathway Precursor pregnenolone progesterone androgens estrogens Hypothalamus parts (3) 1. paraventricular nucleus a. oxytocin production 2. tonic center – a. GnRH production 3. surge center – a. not functional in males because testosterone converted to estrogens once crossed blood brain barrier b. defiminizes hypothalamus c. estradiol bound to alpha-feto protein so cannot cross blood/brain barrier
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Capillary network that carries hypothalamic hormones to the pituitary gland Peptide Hormones (Hypothalamus) 1. GnRH – gonadotropic releasing hormone - causes release of FSH and LH from anterior pituitary - target cells: gonadotrophs 2. Oxytocin - stored in posterior pituitary gland - smooth muscle contraction – uterine contraction- milk ejection 3. ADH – anti-diuretic hormone - stored in posterior pituitary gland - regulates water balance in body 4. TRH – thyrotropin releasing hormone - causes release of TSH from anterior pituitary - target cells: thyrotrophs Protein Hormones (Hypo) 5. CRH – corticotrophin releasing hormone - stimulates release of ACTH from anterior pituitary - target cells: corticotrophs 6. GHRH – growth hormone releasing hormone - stimulates release of GH from anterior pituitary - target cells - somatotrophs 7. GHIH – growth hormone inhibiting hormone - inhibits the release of growth hormone from AA - target cells - somatotrophs N eurotransmitters 8. PIF – prolactin inhibiting factor - dopamine - inhibits release of prolactin from AA - target cells - mammotrophs 9. PRF – prolactin releasing factor - stimulates release of prolactin from AA - target cells - mammotrophs Anterior Pituitary Hormones 5 Cell types 1. gonadotrophs Target cell for GnRH Secrete – FSH and LH 2. mammotrophs Target cell for PRF, and PIF
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This test prep was uploaded on 04/06/2008 for the course ANSCI 331 taught by Professor Youngs during the Spring '08 term at Iowa State.

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Exam II REVIEW ANSWER KEY - Exam II REVIEW ANSWER KEY!...

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