mark wrote:
Quote:
8. Antidiuretic hormone
a. acts on the collecting ducts of the nephron
b. acts by increasing the formation of cyclic-AMP in these cells
c. has a half life of about 24 hours
d. originates as a product of neuronal metabolism in the supraoptic nuclei of the hypothalamus
e. is secreted at a constant rate throughout the day and night
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Answers:
a. True
b. true: the c-amp in effect increases the expression of the aquaporin channels
c. false
d. true
e. false: it depends on the stimulation of various receptors in the CNS and periphery
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