Question detail
How does thyroxine affect the body's metabolic rate?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Hormonal coordination in humans
Question
- A. It decreases the metabolic rate.
- B. It has no effect on the metabolic rate.
- C. It stimulates the basal metabolic rate.
- D. It only affects muscle metabolism.
Answer
The correct option is It stimulates the basal metabolic rate.. 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 stimulates the basal metabolic rate.. It stimulates the basal metabolic rate. 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.
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