Answer :
Final answer:
Vasoconstriction and vasodilation play crucial roles in blood vessel responses to temperature changes.
Explanation:
Vasoconstriction and vasodilation are key processes in regulating blood vessel diameter and blood flow. In the experiment with the frog's foot, the cold water caused vasoconstriction, leading to a decrease in blood vessel diameter and blood flow rate. Conversely, the hot water at 35°C induced vasodilation, resulting in an increase in blood vessel diameter and blood flow rate.
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