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O Levels Biology (5090)•5090/11/O/N/18
Question 13 from 5090/11/O/N/18

Explanation

Organs with dual blood supply from artery and vein

Steps:

  • Most organs receive oxygenated blood only from arteries; veins typically drain blood away.
  • The liver is an exception, receiving oxygenated blood via the hepatic artery and nutrient-rich blood via the portal vein.
  • Evaluate each option's pattern of ✓ (dual supply) and x (single supply) against known organs.
  • Option C matches the pattern where only one specific organ (e.g., liver) has dual supply, while others do not.

Why C is correct:

  • C's pattern (x x ✓) identifies the liver, which uniquely receives arterial blood from the hepatic artery and venous blood from the portal vein, per circulatory anatomy.

Why the others are wrong:

  • A (✓ ✓ x): Incorrectly marks two organs with dual supply; only liver qualifies.
  • B (x x x): Falsely denies dual supply to all, ignoring the liver.
  • D (x x ✓): Duplicate of C but likely mislabels the organ or context.

Final answer: C

Topic: Circulatory system

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