Endocrine system part 2

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Wesleypjones
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212707
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Endocrine system part 2
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2013-04-10 18:14:15
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Endocrine system part
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Endocrine system part 2
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  1. permissive effect
    the actions of some hormones on target cells require a simultaneous or recent exposure to a second hormone.  The second hormone is said to have this effect.
  2. synergist effect
    when the effect of two hormones acting together is greater or more extensive than the effect of each on its own, the two hormones have this effect.
  3. antagonist effect
    when one hormone opposes the actions of another hormone.
  4. hormon secretion
    is regulated by 1) signals from the nervous system 2) chemical changes in the blood 3) other hormones
  5. pituitary gland
    secretes several hormones that control endocrine glands
  6. hypothalamus
    controls the pituitary gland.  It is the major link between the nervous system and the endocrine system
  7. infundibulum
    the stalk that attaches the pituitary gland to the hypothalamus
  8. anterior pituitary gland
    accounts for 75% of the total weight of the gland.  It secretes hormones that regulate a wide range of bodily activities from growth to reproduction
  9. releasing hormones
    stimulate the release of anterior pituitary hormones
  10. inhibiting hormones
    suppresses the release of pituitary gland hormones.  Produced by the hypothalamus
  11. Hypophyseal portal system
    blood flows from capillaries in the hypothalamus into the portal veins that carry blood to capillaries of the anterior pituitary gland.
  12. neurosecretory cells
    clusters of specialized neurons.  They synthesize the hypothalamic inhibiting and releasing hormones in their cell bodies and package the hormones inside vesicles which are eventually released into the Hypophyseal portal system
  13. human growth hormone(hGH)
    released by the anterior pituitary gland.  It is secrete by somatotropins
  14. GhRH- growth releasing hormones
    A hypothalamic hormone which promotes secretion of human growth hormone
  15. GHIH- growth inhibiting hormone
    suppresses the secretion of human growth hormone
  16. Thyroid stimulating hormone (TSH) or thyrotropin
    stimulates the synthesis and secretion of the two thyroid hormones T3 and T4, both produced by the thyroid gland. Produced by the anterior pituitary gland
  17. TRH-thyroid releasing hormone
    from the hypothalamus controls TSH secretion. Release of it depends on blood levels of T3 and T4
  18. Follicle-stimulating hormone (FSH)
    target the ovaries.  It initiates the development of several ovarian follicles.  It also stimulates follicular cells to secrete estrogen and sperm in males. Produced by the anterior pituitary gland
  19. Gonadotropins
    released from the hypothalamus and stimulates FSH and LH release
  20. luteinizing hormone (LH)
    triggers ovulation in females and the secretion of estrogen. In males it stimulates the testes to secrete testosterone. Produced by the anterior pituitary gland
  21. Prolactin (PRL)
    initiates and maintains milk secretion by the mammary glands, only after mammary glands have been prepared by other hormones does it bring about the secretion of milk. Produced by the anterior pituitary gland
  22. PIH- prolactin inhibiting hormone
    produced by the hypothalamus, they regulate PRL secretion.  In females it is dopamine.  Just before menstruation this hormone diminishes.
  23. PRH- Prolactin releasing hormone
    the sucking action of nursing infants causes a reduction of hypothalamic secretion of PIH
  24. Adrenocorticotropico hormone - ACTH
    these are secreted by corticotrophs.  This hormone controls the production and secretion of cortisol and other glucocoticords by the cortex of the adrenal gland
  25. CRH- corticotropin-releasing hormones
    from the hypothalamus.  Stimulates the secretion of ACTH by corticotrophs.  stress related stilmuli, such as low blood glucose or physical trauma also stimulate the release of ACTH
  26. melanocyte-stimulating hormone (MSH)
    increases skin pigmentation in apmphibians.  Not sure why it is present or what it does in humans. Produced by the anterior pituitary gland

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