SPM Biology 2013

Question

4 . Diagram 4 shows the structure of human skin in situations P and Q.

Rajah 4 menunjukkan struktur kulit manusia dalam situasi P dan situasi Q.

(a) Name structures R and S.

Namakan struktur R dan struktur S.

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(b)(i) State one function of the adipose tissue.

Nyatakan satu fungsi tisu adipos.

(ii) Based on Diagram 4, explain the action of blood capillaries in regulating body temperature in situation P.

Berdasarkan Rajah 4, terangkan tindakan kapilari darah dalam mengawal atur suhu badan pada situasi P.

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(c) A boy’s body temperature increases higher than 37. Explain how structures R, S and T act to lower the body temperature back to 37.

Suhu badan seorang budak lelaki meningkat melebihi 37. Terangkan bagaimana struktur R, S dan T bertindak untuk merendahkan suhu badan Kembali ke 37.

 

(d) Explain one importance of the skin besides regulating the body temperature.

Terangkan satu kepentingan kulit selain daripada mengawal atur suhu badan.

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Answer ( 1 )

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    2021-02-27T02:26:34+08:00

    4.a)R:sweat gland

    S:erector muscle

     

    b)i)Adipose tissue is to provide warmth (source of insulation).

    ii)In situation P (cold temperature), the blood capillaries undergo vasoconstriction. The amount of blood flow decreases thus further heat lost via radiation to the surroundings is prevented.

     

    c) R: During high temperatures, the sweat gland will become more active and produces sweat which evaporates allowing heat to be lost to the surroundings.

    S:The erector muscles will relax to lower the skin hairs allowing warm air to escape from the skin

    T:Hair follicles flatten, thus allowing heat trapped to be escaped.

     

    d)The skin acts as a protective barrier (first line of defense) against foreign objects like pathogens.

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