Q: Which equation best represents the negative feedback loop involving the hypothalamus, anterior pituitary, and a target endocrine gland?

$$\text{Hypothalamus} \xrightarrow{+} \text{Anterior Pituitary} \xrightarrow{+} \text{Target Gland} \xrightarrow{-} \text{Hypothalamus}$$

Question 1

Which of the following best describes the role of negative feedback in the regulation of anterior pituitary hormones?

Accepted Answer

It reduces the secretion of hypothalamic and pituitary hormones when target gland hormone levels are high.

Question 2

A patient has abnormally high levels of cortisol. Which of the following would you expect to occur due to negative feedback?

Accepted Answer

Decreased secretion of adrenocorticotropic hormone (ACTH) from the anterior pituitary.

Question 3

Which equation best represents the negative feedback loop involving the hypothalamus, anterior pituitary, and a target endocrine gland?

Accepted Answer

$$	ext{Hypothalamus} \xrightarrow{+} 	ext{Anterior Pituitary} \xrightarrow{+} 	ext{Target Gland} \xrightarrow{-} 	ext{Hypothalamus}$$

Question 4

If the thyroid gland fails to produce enough thyroid hormone, what is the most likely effect on the secretion of thyroid-stimulating hormone (TSH) from the anterior pituitary?

Accepted Answer

TSH secretion will increase due to reduced negative feedback.

Question 5

Which of the following is a real-life example of a negative feedback loop involving the anterior pituitary?

Accepted Answer

High levels of estrogen inhibit the release of gonadotropin-releasing hormone (GnRH) from the hypothalamus.

Question 6

A tumor in the anterior pituitary causes excessive secretion of growth hormone (GH). What would you expect to happen to the secretion of growth hormone-releasing hormone (GHRH) from the hypothalamus?

Accepted Answer

GHRH secretion would decrease due to negative feedback.

Question 7

Which of the following best explains why negative feedback is important in endocrine regulation?

Accepted Answer

It prevents excessive hormone production and maintains homeostasis.

Question 8

Which hormone is most likely to decrease in response to high levels of cortisol due to negative feedback?

Accepted Answer

Adrenocorticotropic hormone (ACTH)

Question 9

A patient with a pituitary disorder has low levels of target gland hormones but high levels of anterior pituitary hormones. Which part of the negative feedback loop is most likely malfunctioning?

Accepted Answer

The target gland is not responding to pituitary hormones, disrupting negative feedback.

Question 10

Which of the following best illustrates the sequence of events in a negative feedback loop regulating anterior pituitary hormone release?

Accepted Answer

Target gland hormone levels increase $$\rightarrow$$ hypothalamus decreases releasing hormone $$\rightarrow$$ anterior pituitary decreases hormone release

Regulation of Anterior Pituitary Hormones: Negative Feedback Loops

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드