本题目来源于试卷: Continuity and Change D.9 Homeostasis，类别为 IB生物学
[单选题]
Identify the line in the taa45 qt f4nxik8,f9pseble below which gives the correct resk55j)od )hk +mdf )fhbponses of the skin tod+d5h)j kkh o))5fb fm a drop in environmental temperature.
A. Sweat glands is Increase sweat production; Arterioles is Vasodilation; Erector pili muscles is Relax
B. Sweat glands is Decrease sweat production; Arterioles is Vasoconstriction; Erector pili muscles is Contract
C. Sweat glands is Increase sweat production; Arterioles is Vasoconstriction; Erector pili muscles is Relax
D. Sweat glands is Decrease sweat production; Arterioles is Vasodilation; Erector pili muscles is Contract
参考答案: B
本题详细解析:
When the environmental temperature drops, your body responds by trying to conserve heat. Reducing sweat production means there is less sweat to evaporate from the skin's surface, so less heat is lost. Vasoconstriction of the blood vessels reduces the volume of blood reaching the surface of the heat, so less heat is lost by radiation. Contraction of the erector pili muscles makes the hairs of the skin stand up, trapping an insulating layer of air next to the skin, again reducing heat loss by radiation and also by convection. Choice B is, therefore, the correct answer. Choices A, C and D are incorrect as they have one or more factors wrong.
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