Multiple choice

The pigments present in the digestive fluid bile are called

  1. carotenoids

  2. haemoglobin

  3. erythrocytes

  4. biliverdin and bilirubin

  5. chlorophyll
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Biliverdin and bilirubin are the pigments that give bile its colour. These are produced by the breakdown of the dead and worn out red blood cells. Biliverdin is a green pigment formed by the catabolism of haemoglobin, and converted to bilirubin in the liver. It may also arise from oxidation of bilirubin.

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