Question detail
Which of the following best describes the effect of vasoconstriction on blood vessels?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
The human nervous system
Question
- A. Blood vessels widen
- B. Blood vessels narrow
- C. Blood vessels remain unchanged
- D. Blood vessels rupture
Answer
The correct option is Blood vessels narrow. This answer is correct because it matches the approved learning objective to explain (HT only) how vasoconstriction and shivering help raise body temperature in the subtopic Control of body temperature (biology only).
Explanation
The correct option is Blood vessels narrow. Blood vessels narrow is correct because it directly supports the approved learning objective to explain (HT only) how vasoconstriction and shivering help raise body temperature. This belongs to the subtopic Control of body temperature (biology only) within The human nervous system, 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 Control of body temperature (biology only).
Common mistake
Misunderstanding Vasoconstriction
Students often confuse vasoconstriction with vasodilation, thinking both processes raise body temperature.
Remember that vasoconstriction narrows blood vessels to reduce blood flow to the skin, conserving heat, while vasodilation increases blood flow to release heat.
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