Explain (HT only) how vasoconstriction and shivering help raise body temperature.

In the subtopic Control of body temperature (biology only), this learning objective focuses on explain (HT only) how vasoconstriction and shivering help raise body temperature. Within The human nervous system, students should explain this idea in the exact curriculum context rather than as an isolated fact. Approved keywords for this objective include body temperature, HT only, shivering, and vasoconstriction. vasoconstriction means the narrowing of blood vessels, which reduces blood flow to the skin and helps to conserve body heat when temperatures are low. Avoid students often confuse vasoconstriction with vasodilation, thinking both processes raise body temperature; instead remember that vasoconstriction narrows blood vessels to reduce blood flow to the skin, conserving heat, while vasodilation increases blood flow to release heat. For exam answers, clearly explain the processes of vasoconstriction and shivering in your answers, focusing on how they contribute to raising body temperature.