Noun:
-
membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional
-
membranous structure enclosing the yolk of eggs in birds, reptiles, marsupials, and some fishes; circulates nutrients to the developing embryo
用作名词 (n.)
- The yolk sac is gradually vascularized.
卵黄囊逐渐被血管化了。
- The dye Trypan Blue has a remarkable biphasic effect on pinocytosis by yolk sal.
染料锥虫蓝对卵黄囊的胞饮作用具有明显的双向作用。
