Which of the following describes what happens to the muscles and the arteriole walls in the skin when the core body temperature is below normal?
Muscles of skin Arteriole walls in skin
(A) Relax to lower epidermal hairs Expand
(B) Contract to raise epidermal hairs Contract
(C) Relax to raise epidermal hairs Expand
(D) Contract to lower epidermal hairs Contract - HSC - SSCE Biology - Question 8 - 2015 - Paper 1
Question 8
Which of the following describes what happens to the muscles and the arteriole walls in the skin when the core body temperature is below normal?
Muscles of skin Art... show full transcript
Worked Solution & Example Answer:Which of the following describes what happens to the muscles and the arteriole walls in the skin when the core body temperature is below normal?
Muscles of skin Arteriole walls in skin
(A) Relax to lower epidermal hairs Expand
(B) Contract to raise epidermal hairs Contract
(C) Relax to raise epidermal hairs Expand
(D) Contract to lower epidermal hairs Contract - HSC - SSCE Biology - Question 8 - 2015 - Paper 1
Step 1
Muscles of skin
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Answer
When the core body temperature is below normal, the muscles in the skin contract to raise the epidermal hairs. This response serves to create an insulating layer of air, helping to trap heat and conserve body temperature.
Step 2
Arteriole walls in skin
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Answer
In response to decreased core temperature, the arteriole walls in the skin contract. This vasoconstriction reduces blood flow to the skin, which helps limit heat loss and maintain core body temperature.
Step 3
Conclusion
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Answer
Thus, the correct option that describes these physiological responses is (B): 'Contract to raise epidermal hairs' for muscles of skin and 'Contract' for arteriole walls in skin.
