Urdu Meanings, Pronounciation and Synonyms:
yolk sac
(Pronunciation -تلفظ سنیۓ )
US: 
Slow
Normal
Noun: yolk sac
| 1. yolk sac [ Synonyms: umbilical vesicle, vesicula umbilicus, vitelline sac] | |
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Membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional
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| 2. yolk sac | |
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Membranous structure enclosing the yolk of eggs in birds, reptiles, marsupials, and some fishes; circulates nutrients to the developing embryo
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