thyroid Flashcards
hypothalamo-pituitary-thyroid axis: recall the hypothalamo-pituitary-thyroid axis and its regulation
1
Q
by which mechanism is the hypothalamo-pituitary-thyroid axis controlled
A
negative feedback
2
Q
what do T3 and T4 have direct negative feedback over
A
thyrotroph cell in anterior pituitary by reducing TSH release
3
Q
what do T3 and T4 have indirect negative feedback over
A
hypothalamus by reducing TRH release
4
Q
what effect does iodide have on the thyroid (Wolff-Chaikoff effect)
A
suppresses release of T3 and T4
5
Q
what do oestrogens do to TSH release in anterior pituitary
A
stimulate
6
Q
what do glucocorticoids do to TSH release in anteror pituitary
A
suppress
7
Q
diagram of hypothalamo-pituitary-thyroid axis
A
diagram
