| 单词 | yolk sac |
| 释义 | yolk sac (once / 562825 pages) n WORD FAMILY yolk sac: yolk sacs USAGE EXAMPLESAfter normal implantation, part of a mammalian embryo reorganizes itself into what will become the placenta and the yolk sac. Science Magazine(May 04, 2016) They took no food, living on the large yolk sac. Rachel Carson, Silent Spring(1962) During that time, it undergoes several physiological adaptations, including absorbing the yolk sac within its body and fully inflating its lungs. New York Times(Apr 04, 2016) 1n membranous structure enclosing the yolk of eggs in birds, reptiles, marsupials, and some fishes; circulates nutrients to the developing embryo Hyper sac a structure resembling a bag in an animal 2n membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional Syn|Hyper umbilical vesicle, vesicula umbilicus, vitelline sac sac a structure resembling a bag in an animal |
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