Anterior pit

Question 1

what are characteristics of releasing hormones

Answer 1

secretion in pulses
act on specific membrane receptors
tranduce signals via second messengers
stimulates synthesis/release of pituitary hormones
stimulates hyperplasia and hypertophy of target cells in the pituitary gland

Question 2

what is the hypophyseal portal system

Answer 2

system of blood vessels in the median eminence connecting the hypothalamus with AP
quickly transports hormones betweent the hypothalamic nuclei and AP
communication between two different tissue types

Question 3

what is an AP hormone

Answer 3

hormones produced by the AP (in repsonse to releasing hormones) enter a secondary capillary system abd from there drain into the circulation

Question 4

what is growth hormone

Answer 4

most abundent
growth-promoting actions on muscle and skeleton
direct effects - result of GH binding its receptor on target cells
indirect effects - are mediated primarily by IGF-1

Question 5

what is prolactin

Answer 5

• breast development and milk production (infertility)
• dopamine inhibits secretion
• stress, exercis, suckling and pregnant
  behaviour effects - maternal

Question 6

what is ACTH

Answer 6

adrenocorticotropin hormone
derived from propiomelanocortin
stimulates the adrenal cortex
response to stress - fight or flight
osmoregulation
development (amphobians)

Question 7

what is FSH LH TSH

Answer 7

TSH - stimulates thyroid cells to trap iodide and synthesize and secrete thyroid hormones
LH - stimulates cells of the theca cells corpus luteum and leydig to synthesize sex hormones
FSH - proliferation of granulosa cells in overys
binds to seritoli cells in the seminiferous tubules to induce spermatogenesis
stimulates andregen binding protein