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In animals, blood clots serve the function of

  • A.consuming invading organisms
  • B.helping them match the background coloration of the habitat
  • C.stimulating production of killer T lymphocytes
  • D.repairing damage to the body wall

Answer: D

Correct answer: repairing damage to the body wall

A clot plugs the breach: it stops the loss of blood and, just as importantly for defence, seals the wound against microbes while the tissue underneath is repaired. It is a physical barrier rather than an immune recognition mechanism - though the mesh of fibrin also traps bacteria within it.

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