50. What are the special
structuresof the avian
digestive tube and their
respective functions?

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The digestive tube birds has special
, in this sequential : the
crop, the and the gizzard.

crop has the of temporary
storage ingested food and is a more
area of the esophagus.
The proventriculus the chemical
stomach the birds where is
mixed with enzymes. The
gizzard a muscular pouch serves
as a stomach where the
is ground to the exposure
area the food particles the
digestive enzymes act.