Question detail
What happens to blood vessels during vasodilation?
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. They constrict
- B. They remain unchanged
- C. They widen
- D. They become rigid
Answer
The correct option is They widen. This answer is correct because it matches the approved learning objective to explain (HT only) how vasodilation and sweating help lower body temperature in the subtopic Control of body temperature (biology only).
Explanation
The correct option is They widen. They widen is correct because it directly supports the approved learning objective to explain (HT only) how vasodilation and sweating help lower 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 Vasodilation
Students often confuse vasodilation with vasoconstriction, thinking both processes lower body temperature.
Remember that vasodilation involves the widening of blood vessels, which increases blood flow to the skin, allowing heat to escape and thus lowering body temperature.
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