FUNCTIONAL ASPECTS OF THE HYPOTHALAMIC–HYPOPHYSEAL UNIT

Question 1

Resembles a typical servomechanism and forms the basis of our understanding of hypothalamic–pituitary function

Answer 1

Negative Feedback

Question 2

Released in the blood and circulates to the hypothalamus and pituitary to suppress further TRH and TSH production.

Answer 2

Thyroxine

Question 3

The feedback of thyroxine at the level of the pituitary is called

Answer 3

Short feedback loop

Question 4

Feedback between the pituitary and hypothalamus

Answer 4

Ultrashort feedback loop

Question 5

Feedback between the pituitary and hypothalamus

Answer 5

Ultrashort feedback loop

Question 6

Refers to the process of entraining or synchronizing these external cues into the function of internal biologic clocks

Answer 6

Zeitgeber (“time giver”)

Question 7

With ACTH, the nadir of secretion is between

Answer 7

11PM and 3AM