Yolk Sac (Noun)
Meaning 1
Membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional.
Classification
Nouns denoting animals.
Examples
- The yolk sac provides essential nutrients to the developing embryo before the placenta takes over this function.
- In mammalian embryos, the yolk sac is a critical structure that facilitates the exchange of gases and waste products.
- The yolk sac is a vascular structure that contains the first blood cells and vessels of the embryo.
- During embryonic development, the yolk sac functions as a primitive circulatory system until the heart begins to beat.
- The yolk sac is eventually incorporated into the gut of the developing embryo, but its role in early development is essential for growth and survival.
Synonyms
Meaning 2
Membranous structure enclosing the yolk of eggs in birds, reptiles, marsupials, and some fishes; circulates nutrients to the developing embryo.
Classification
Nouns denoting animals.