The thyroid hormones T3 (triiodothyronine)
and T4 (thyroxine) provide feedback to the
anterior pituitary. This feedback causes the
anterior pituitary to
Select one
a Reduce the synthesis and release of
the tyrotropin releasing hormone (TRH)
b. Increase the synthesis and release of
the thyroid stimulating hormone (TSH)
c. Reduce the synthesis and release of
the thyroid stimulating hormone (TSH)
d. Increase the synthesis and release of
the tyrotropin releasing hormone (TRH)
Answers
Answer:Reduce the synthesis and release of
the thyroid stimulating hormone (TSH)
Explanation:
The hormones of anterior pituitary are under the control of hypothalamus.
So, TRH is produced and released by hypothalamus. It stimulates production and release of TSH from the anterior pituitary. TRH acts on thyroid gland and stimulates production of T4 and T3. Now it is an example of negative feedback. So the thyroid hormone production and release must be decreased.
First option is not correct is TRH is not produced and released by anterior pituitary. For the same reason fourth option is also incorrect.
Second option is also not correct because thyroid hormone production must be decreased by this feedback.
So when there is increase in T3 and T4 in circulation there is feedback inhibition to hypothalamus and pituitary gland to make their level normal. In hypothalamus it causes decreased production and release of TRH. In anterior pituitary it causes decreased production and release of TSH. Again, decreased production and release of TRH from hypothalamus also cause decreased production and release of TSH frpm anterior pituitary. So there will be overall decrease in T3 and T4 production to make their level normal in circulation.
So your answer is option c)Reduce the synthesis and release of
the thyroid stimulating hormone (TSH)
.
Answer:
Explanation:
Oxytocin is the hormone released from pituitary
of the mother, once fetal development is
completed.