Question detail

What is the role of negative feedback in regulating thyroxine levels?

Try the question, check the answer, then read the explanation to understand the curriculum point.

Show answer Topic hub Objective page

At a glance

MCQ

Type

practice

Style

Topic

Hormonal coordination in humans

Question

A. It increases thyroxine production when levels are high.
B. It decreases thyroxine production when levels are low.
C. It maintains thyroxine levels within a narrow range.
D. It has no effect on thyroxine production.

Answer

The correct option is It maintains thyroxine levels within a narrow range.. This answer is correct because it matches the approved learning objective to explain (HT only) how thyroxine levels are controlled by negative feedback in the subtopic Feedback systems (HT only).

Explanation

The correct option is It maintains thyroxine levels within a narrow range.. It maintains thyroxine levels within a narrow range. is correct because it directly supports the approved learning objective to explain (HT only) how thyroxine levels are controlled by negative feedback. This belongs to the subtopic Feedback systems (HT only) within Hormonal coordination in humans, so the explanation must stay tied to that curriculum context. The other options are incorrect because they either do not answer this learning objective, use a vague statement, or move away from Feedback systems (HT only).

Common mistake

Thyroxine Control Confusion

Students often confuse the role of thyroxine in metabolism with its regulation by negative feedback, thinking it only increases metabolism without understanding the feedback mechanism.

To fix this, students should focus on how thyroxine levels are monitored by the hypothalamus and pituitary gland, and how an increase in thyroxine leads to a decrease in TSH production, illustrating the negative feedback loop.

Related flashcards

Flashcard 1 of 5

Press Space to flip, arrows to move