I can\'t seem to find these answers in my textbook, I\'m assuming that the first

Question

I can't seem to find these answers in my textbook, I'm assuming that the first answer is to further produce thyroid hormone but I'm not sure and as far as the second my best assumption is negative feedback.

Increased thyroid hormone levels in the blood result in:
A) further stimulus to produce thyroid hormone.
B) decreased release of thyroid-stimulating hormone from the anterior pituitary.
C) increased secretion of thyrotropin-releasing hormone from the hypothalamus.
D) inhibition of parathyroid hormone release from the parathyroid glands.

AND

To adapt to high hormone concentrations, many target cells have the capacity for:
A) negative feedback.
B) positive feedback.
C) up-regulation.
D) down-regulation.

Explanation / Answer

Increased thyroid hormone levels in the blood result in:

B) decreased release of thyroid-stimulating hormone from the anterior pituitary.

Almost all hormone systems maintain homeostasis by negative feedback, meaning they contain at least one step of inhibition. The total effect is to minimize any external change introduced to the system, which in this case is an increase of thyroid hormones in the blood. Remember, although positive feedback occurs in the body, it is almost a rarity in endocrine function.

AND

To adapt to high hormone concentrations, many target cells have the capacity for:

D) down-regulation. 

Many target cells have the capacity for down-regulation as part of a negative feedback system.

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