In avian anatomy, which structure is responsible for transporting the egg from the ovary to the oviduct?

In avian anatomy, which structure is responsible for transporting the egg from the ovary to the oviduct?

• A. To expel the fetus.
• B. To transport the egg from the ovary to the oviduct.
• C. To give nourishment to the fetus.
• D. To contract during labor.

Answer: (B)

The key idea is how the ovulated egg enters the oviduct in birds. The infundibulum, the funnel-shaped first part of the oviduct, catches the released ovum from the ovary and guides it into the oviduct proper. From there, the egg is moved along by smooth muscle contractions and the ciliary lining of the oviduct as it passes through the various regions where albumen, membranes, and the shell are added before laying. The other options describe processes that aren’t about avian egg transport—things like expelling a fetus, nourishing a fetus, or labor contractions pertain to different reproductive contexts and aren’t how the avian egg is moved from ovary into the oviduct.

The key idea is how the ovulated egg enters the oviduct in birds. The infundibulum, the funnel-shaped first part of the oviduct, catches the released ovum from the ovary and guides it into the oviduct proper. From there, the egg is moved along by smooth muscle contractions and the ciliary lining of the oviduct as it passes through the various regions where albumen, membranes, and the shell are added before laying. The other options describe processes that aren’t about avian egg transport—things like expelling a fetus, nourishing a fetus, or labor contractions pertain to different reproductive contexts and aren’t how the avian egg is moved from ovary into the oviduct.