14. What are respiratory
pigments? What are some
respiratory pigments and in
which animal groups can each
of them be found?

Gap-fill exercise

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
Respiratory pigments are
present in the that bind to
transporting it to tissues.

In vertebrates respiratory pigment
is , reddish due to iron
of its . In crustacean and
arthropods and in
molluscs the respiratory is
hemocyanin, blue to the copper
its composition. Annelids
hemoglobin, hemerythrin and
as respiratory pigments.