Heterophils in avian blood are equivalent to __ in mammalian blood.
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How many air sacs make up the avian respiratory system?
How many air sacs make up the avian respiratory system?
In birds, which gonad is rudimentary and doesn’t function?
In birds, which gonad is rudimentary and doesn’t function?
The bony ridge on the sternum of strong flying birds is the
The bony ridge on the sternum of strong flying birds is the
Which gland secretes a hormone that regulates body and feath…
Which gland secretes a hormone that regulates body and feather growth and may stimulate the migration urge?
The bursa of Fabricius stimulates the production of
The bursa of Fabricius stimulates the production of
Avian red blood cells differ from mammalian red blood cells…
Avian red blood cells differ from mammalian red blood cells in that they are
What type of feather lacks a true shaft and provides insulat…
What type of feather lacks a true shaft and provides insulation for the bird?
In birds the __ is located at the terminal end of the digest…
In birds the __ is located at the terminal end of the digestive system.
Which two hormones are directly responsible for the physical…
Which two hormones are directly responsible for the physical and behavioral changes that are associated with a female in heat?