OCR GCSE Biology Practice Exam 2026 – Comprehensive All-in-One Guide to Exam Success

Question: 1 / 1090

What is the effect of blood vessels constricting during vasoconstriction?

Increased energy transfer to the surroundings

Decreased body temperature

Reduced blood flow near the surface of the skin

Vasoconstriction involves the narrowing of blood vessels, which has a crucial role in regulating body temperature and blood flow. When blood vessels constrict, particularly those near the surface of the skin, the blood flow to these areas is reduced. This mechanism helps to preserve heat in the body by minimizing the amount of blood that reaches the skin's surface, where heat can be lost to the environment.

This process is particularly important in cold conditions, as it allows the body to maintain a stable internal temperature despite external temperature drops. By directing blood flow away from the surface, the core body temperature is better protected. Hence, the correct response appropriately identifies the physiological effect of vasoconstriction.

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Enhanced nutrient absorption

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