10. On average what is the life
duration of the red blood
cells? Where are they
destroyed? What is the
destination of the heme
groups after the destruction of
hemoglobin molecules?

Gap-fill exercise

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On average red cells live around
days. The spleen the main organ
old red blood are destroyed.

During red blood cell the
heme groups into bilirubin and
substance is then by the liver
later excreted in bowels as part
the bile.