Endocrine- Pituitary

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Author:
Mawad
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306945
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Endocrine- Pituitary
Updated:
2015-09-03 22:10:45
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vetmed endocrinology pituitary
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vetmed endocrinology
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  1. GH is released from the ________ in response to GHRH from the _________, causing the release of _______.
    anterior pituitary; hypothalamus; IGF-I
  2. Prolactin is released from the _______ in response to ________ from the hypothalamus.
    anterior pituitary; TRH
  3. ACTH is released from the ________ in response to ______ release from the hypothalamus; it affects the _______, causing it to release _______.
    anterior pituitary; CRH; adrenal gland; hyrocortisone
  4. TSH is released from the _________ in response to _______ from the hypothalamus; it affects the _______, causing it to release _______.
    anterior pituitary; TRH; thyroid gland; thyroxine
  5. LH/FSH are released from the __________ in response to ________ released from the hypothalamus.
    anterior pituitary; GnRH
  6. Vasopressin is released from the _________ in response to _______ from the hypothalamus; it affects the ________, causing...
    posterior pituitary; vasopressin; kidney; decrease in urine volume
  7. Oxytocin is released from the ________ in response to _______ from the hypothalamus.
    posterior pituitary; oxytocin
  8. The pars nervosa differentiates from _________.
    nervous tissue
  9. The pars distalis differentiates from _______.
    ectoderm
  10. The pars intermedia differentiates from ____________.
    ectoderm/nerve junction
  11. In what species is the pars intermedia more developed/important?
    species that seasonally change hair coat or color (ex. horses, frogs)
  12. What hormones are in the somatotrophin-lactogen group?
    prolactin, growth hormone
  13. What hormones are in the two subunit group?
    LH, FSH, TSH
  14. What hormones are gonadotropins?
    LH and FSH
  15. When POMC is in the pars intermedia, it is cleaved to _________; when it is in the pars distalis, it is cleaved to ________.
    MSH; ACTH
  16. Growth hormone aka=
    somatotropin
  17. GH is secreted from the __(2)__ in endocrine concentrations.
    placenta and pituitary
  18. Describe the negative feedback mechanism of GH.
    GH inhibits the release of hypothalamic GHRH; IGF-I released in response to GH stimulates the release of somatostatin, which inhibits pituitary release of GH
  19. An increase in glucose causes a(n) ________ in GH.
    decrease
  20. An increase in amino acid conc. causes a(n) ______ in GH.
    increase
  21. An increase in exercise causes a(n) ________ in GH.
    increase
  22. An increase in sleep causes a(n) ________ in GH.
    increase
  23. An increase in stress causes a(n) ________ in GH.
    decrease
  24. An increase in ADH causes a(n) ________ in GH.
    increase
  25. An increase in ghrelin causes a(n) ________ in GH.
    increase
  26. GH secretion is maximal during ________, especially in _________.
    sleep; growing stock
  27. What is unique about GH release?
    it occurs in short bursts
  28. GH has direct actions via ____________; it has indirect actions via ___________.
    GH receptors on target cells; IGF-I (insulin-like growth factor I)
  29. What are the biological actions of GH?
    bone growth, protein, carb, and fat metabolism, lactation
  30. GH antagonizes _________.
    insulin
  31. BST.
    bovine somatotropin- milk production
  32. _______ inhibits prolactin secretion.
    Dopamine
  33. _________ stimulates prolactin secretion.
    Thyrotropin-releasing hormone (TRH)
  34. __________ drugs increase milk production by disinhibiting prolactin.
    Dopamine antagonistic
  35. Other than the pituitary, what is the other source of prolactin?
    placenta during pregnancy
  36. Describe the feedback regulation of prolactin.
    prl inhibits its own synthesis and secretion by affecting the pituitary and by causing dopamine release from the hypothalamus
  37. An increase in estrogen causes a(n) __________ in prolactin.
    increase
  38. Suckling of young causes a(n) _________ in prolactin.
    increase
  39. Pregnancy causes a(n) _________ in prolactin.
    decrease
  40. Sleep causes a(n) __________ in prolactin.
    increase
  41. What are the biological actions of prolactin? (3)
    mammary growth, lactation, maintenance of CL (rats), paternal behavior
  42. _________ stimulates release of TSH (thyroid stimulating hormone) from the _________.
    Thyrotropin releasing hormone (TRH); anterior pituitary
  43. ________ decreases TSH release.
    Somatostatin
  44. Describe the negative feedback regulation of TSH.
    TSH causes release of T3 and T4, which in turn reduce secretion of TRH from the hypothalamus AND TSH secretion from the anterior pituitary
  45. Cold stress causes a(n) ________ in TSH.
    increases
  46. Estrogen causes a(n) ________ in TSH.
    increase
  47. Glucocorticoids cause a(n) ________ in TSH.
    decrease
  48. GH causes a(n) ________ in TSH.
    decrease
  49. What are the biological actions of TSH?
    stimulates synthesis and secretion of thyroid hormone in the thyroid
  50. Dog pars intermedia tumors make _______; horse oars intermedia tumors make ________.
    ACTH; MSH
  51. CRH from the _________ stimulates ______ synthesis, which is cleaved to ________ in the ________ and secreted.
    hypothalamus; POMC; ACTH; anterior pituitary
  52. Describe feedback regulation of ACTH.
    ACTH stimulates glucocorticoids that inhibit CRH release from the hypothalamus and ACTH from the pituitary
  53. What are the biological actions of ACTH?
    stimulates synthesis and secretion of glucocorticoids from the adrenal
  54. What are the biological actions of MSH?
    stimulates pigment in melanocytes
  55. What are the biological actions of beta-LPH (which originates from POMC)?
    stimulates lipolysis in fat cells
  56. Excessive ACTH.
    cushings dz
  57. Deficient ACTH.
    addisons dz
  58. Pituitary dwarfism is caused by ______________, which leads to failure of __________.
    juvenile-onset panhypopituitarism; development of the adenohypophysis
  59. What are the clinical signs of juvenile onset hypopituitarism? (5)
    failure to attain somatic maturation (dwarfism), retention of juvenile hair coat, alopecia, shrill bark, skin lesions
  60. With juvenile onset panhypopituitarism, there is deficiency of __(4)__ and subnormal secretion of __(3)__.
    GH, TSH, ACTH, GTH [trophic hormones]; thyroxine, cortisol, sex steroids [target organ hormones]
  61. With juvenile onset panhypopituitarism, there is lack of ______ and subsequently ________, leading to small stature.
    GH (somatotrophin); IGF-1
  62. How does stress cause alopecia?
    stress decreases GH--> GH is required for hair growth
  63. What gene is deleted in dogs, leading to pituitary dwarfism?
    LHX3
  64. How is hypothyroidism released to panhypopituitarism in adult animals?
    chronic hypothyroid--> atherosclerosis of internal carotid--> pituitary ischemia--> secondary pituitary ischemic necrosis--> panhypopituitarism
  65. How is hypophysitis related to panhypopituitarism?
    inflammation/swelling of pituitary--> pituitary surrounded by bone and tissue has no where to go--> necrosis--> panhypopituitarism
  66. What are the pathogenic mechanisms of hypophysitis? (6)
    meningitis, encephalitis, otitis media, sinusitis, osteomyelitis, septicemia (indirect)
  67. Describe the features of pituitary adenomas. (4)
    benign, slow growth, compression of adjacent structures, extension along lines of least resistance
  68. What are the 2 types of pituitary adenomas?
    functional (hormone-producing), non-functional
  69. Are functional or non-functional pituitary adenomas more difficult to diagnose?
    non-functional are more difficult to diagnose and worse prognosis because they don't show clinical signs until they are huge
  70. A functional chromophobe adenoma derives from ___________ and is located in the _____________; it causes hypersecretion of _________, leading to __________; the syndrome associated with this is ____________.
    pituitary corticotrophs; pars distalis/intermedia; ACTH; adrenal cortex hyperplasia; Cushing's disease
  71. A non-function pituitary adenoma is a potential cause of ___________; it causes it's worst effects due to being a ___________.
    adult-onset panhypopituitarism; space-occupying lesion
  72. What are the functional disturbances associated with adult-onset panhypopituitarism? (5)
    gonadal atrophy, thyroid follicular cellular atrophy, adrenal cortical atrophy, hypoglycemia, PU/PD (no ADH)
  73. What are the clinical signs of pituitary chromophobe adenoma in a parakeet? (6)
    impaired vision, exophthalmos, disturbance in balance, seizures, polydipsia, diarrhea
  74. PPID in horses is a disease of ______.
    age
  75. Par intermedia tumors of horses make...
    MSH, endorphins (affected horses are more chill than normal)
  76. Clinical signs of PPID in horses.
    failure to shed haircoat, long/matted hair
  77. Describe juvenile-onset hyperfunction of STH-secreting acidophils. What causes it? (2)
    gigantism; somatotroph hyperplasia, somatotroph adenoma
  78. Describe adult-onset of growth-hormone excess. What causes it in dogs? (3)
    acromegaly;acidophil adenoma, iatrogenic GH (progestagen for estrus control), prolonged luteal phase (luteal cysts)
  79. What are the clinical signs of acromegaly in dogs? (7)
    excessive skin folds, abnormal hair growth, respiratory stridor (increased soft tissue), abdominal enlargement, PU/PD, expansion of interdental space, fatigue
  80. Describe the diabetogenic action of GH excess. (5)
    down regulate insulin receptors, progressive hyperglycemia, glycosuria, beta cell hyperplasia, insulin-resistance
  81. Feline acromegaly is caused by __________.
    acidophil adenom (somatotrophs of pars distalis)
  82. How do you diagnose acidophil adenoma in cats?
    measure IGF-1
  83. Describe a prolactinoma in a rat. (2)
    cystic hyperplasia, mammary gland development
  84. Craniopharyngioma occurs in _____ animals; it leads to... (3) [rare]
    young; pituitary dwarfism; panhypopituitarism; CNS deficits
  85. Diabetes insipidus is a syndrome resulting from deficient _________, resulting in ____________.
    ADH from pars nervosa; failure of active water resorption

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