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JAMB Biology 1993 Question 21

Question 21

Transport in Animals

The main function of blood in mammals is to transport

  1. A.excretory materials from tissues
  2. B.carbondioxide from lungs to tissues
  3. C.digested food from all the body tissues
  4. D.oxygen to the lungs.
Show the answer and explanation

Answer: A (excretory materials from tissues)

Explanation

Blood carries wastes such as urea and carbon dioxide away from the tissues. The other options have the direction wrong: CO2 goes to the lungs, food goes to the tissues and oxygen comes from the lungs.