Question

endoderm, urinary bladder (During week 3, teh allantois arises as a ventral endodermal outgrowth from the part of the hindgut that forms the urinary bladder.)

Answer 1

During week 3 of embryonic development, the allantois, a finger-like outpocketing of the yolk sac, develops into the primitive excretory duct of the embryo, which will become part of the urinary bladder.

Step-by-step explanation:

The subject of this question is Biology, specifically embryology and the development of the urinary bladder.

During week 3 of embryonic development, the allantois, which is a ventral endodermal outgrowth from the part of the hindgut that forms the urinary bladder, develops. The allantois is a finger-like outpocketing of the yolk sac that becomes the primitive excretory duct of the embryo, ultimately becoming part of the urinary bladder.

This process is crucial in the formation of the urinary system during embryogenesis.