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WAEC Biology 2003 Question 17

Question 17

Homeostasis

In cold condition, the mammalian body reacts in the following ways except

  1. A.shivering of the body
  2. B.dilation of the capillaries supplying blood to the skin
  3. C.constriction of blood capillaries in the skin
  4. D.increased rate of chemical changes in the body
Show the answer and explanation

Answer: B (dilation of the capillaries supplying blood to the skin)

Explanation

In the cold, skin blood vessels narrow to keep heat in. Dilation of skin capillaries happens in hot conditions to lose heat.