ls2homeostasis

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Author:
Anonymous
ID:
10688
Filename:
ls2homeostasis
Updated:
2010-03-15 19:34:16
Tags:
LS2
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Description:
Homeostasis for LS2
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  1. What hormones are secreted by the posterior pituitary gland?
    oxytocin and vasopressin / antidiuretic hormone
  2. oxytocin
    • Source: posterior pituitary
    • Function: smooth muscle contraction; bonding between mother and baby
  3. ADH
    • Name: antidiuretic hormone or vasopressin
    • Source: posterior pituitary
    • Target: collecting ducts, blood vessels
    • Function: water retention; vasoconstriction
  4. What are the major nerves connecting the hypothalamus to the posterior pituitary?
    • PVN (paraventricular nucleus): oxytocin secretion
    • SON (supraoptic nucleus): vasopressin secretion
  5. What are the three aspects of homeostasis?
    • 1. receptors
    • 2. control center
    • 3. effectors
  6. What is the control center for temperature homeostasis?
    hypothalamus
  7. What are the effectors for temperature homeostasis?
    Cold: skeletal muscles (shivering), blood vessels (vasoconstriction)

    Hot: sweat glands, blood vessels (vasodilation)
  8. How does the graph of metabolic rate versus temperature differ for endotherms and ectotherms?
    • Ectotherms: metabolism increases as temperature increases
    • Endotherms: metabolism decreases, reaches a minimum, then increases as temperature increases

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