OCR General Certificate of Secondary Education (GCSE) Biology Practice Exam

Disable ads (and more) with a membership for a one time $2.99 payment

Master GCSE Biology with our interactive exam quizzes. Utilize dynamic questions and thorough explanations to boost your understanding and excel in your GCSE Biology exam!

Start Multiple Choice Practice Test
Start Flash Cards

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

What happens during vasoconstriction?

  1. Blood vessels near the surface dilate to lose heat

  2. Less blood flows near the surface to reduce heat loss

  3. Blood vessels expand to allow more blood flow

  4. Blood is redirected to the extremities

The correct answer is: Less blood flows near the surface to reduce heat loss

During vasoconstriction, the body’s response mechanism causes blood vessels, particularly those near the surface of the skin, to constrict or narrow. This narrowing reduces the flow of blood near the skin's surface, which in turn minimizes heat loss. By limiting the amount of warm blood that reaches these peripheral areas, the body is able to conserve heat, especially in cold environments. This process is crucial for maintaining core body temperature and ensuring that vital organs remain adequately supplied with blood, even when external temperatures are low. Vasoconstriction is part of the body’s homeostatic mechanisms to adapt to temperature changes, highlighting the importance of blood vessel regulation in thermoregulation.

More Questions Like This