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O Levels Biology (5090)•5090/11/M/J/22
Question 21 from 5090/11/M/J/22

Explanation

Matching skin structures to anatomical positions

Steps:

  • Recall standard human skin diagram: sweat glands are deep, coiled ducts in dermis; hair follicles are tubular extensions from epidermis into dermis; blood vessels form networks in dermis.
  • Identify X as deepest structure, matching sweat gland's position below surface.
  • Identify Y as central, shaft-like structure, matching hair follicle.
  • Identify Z as tubular, branching network, matching blood vessel.

Why C is correct:

  • C aligns with anatomical layout where sweat glands (X) lie below hair follicles (Y) in dermis, with blood vessels (Z) adjacent for nutrient supply.

Why the others are wrong:

  • A misplaces blood vessel as X, which is too superficial for vascular networks.
  • B swaps X and Y, inverting sweat gland and hair follicle depths.
  • D reverses Y and Z, placing hair follicle where blood vessels typically network.

Final answer: C

Topic: Temperature control

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