CIE iGCSE Co-Ordinated Science B13.3 Homeostasis Exam Style Questions Paper 2
Question
The arterioles that supply blood to the skin’s surface capillaries undergo vasodilation.
Which row describes the effect of this on the core body temperature and the volume of blood passing through these capillaries?
▶️Answer/Explanation
Ans: C
Question
Which statement about the role of blood vessels in the skin is correct?
(A) If the environment is too cold, vasoconstriction of capillaries occurs.
(B) If the environment is too cold, vasodilation of arterioles occurs.
(C) If the environment is too hot, vasoconstriction of capillaries occurs.
(D) If the environment is too hot, vasodilation of arterioles occurs.
▶️Answer/Explanation
Ans : D
Question
The graph shows the variation of body temperature over time of a healthy person at rest.
How will the body reverse the temperature change shown between times X and Y?
(A) decreased breathing rate
(B) decreased pulse rate
(C) shivering
(D) sweating
▶️Answer/Explanation
Ans: D
Question
Which statement about temperature control is correct?
A. Vasoconstriction near the skin surface and shivering will cool the body down.
B. Vasoconstriction near the skin surface and sweating will warm the body up.
C. Vasodilation near the skin surface and shivering will warm the body up.
D. Vasodilation near the skin surface and sweating will cool the body down.
▶️Answer/Explanation
Answer: D. Vasodilation near the skin surface and sweating will cool the body down.
Explanation: Vasodilation increases blood flow to the skin, allowing heat to be lost, and sweating helps cool the body through evaporation.