Human ReproductionHard
Question
Which extra-embryonic membrane in humans prevents desiccation of the embryo inside the uterus ?
Options
A.Chorion
B.Allantois
C.Yolk sac
D.Amnion
Solution
Amnion is an extra embryonic membrane that surrounds embryo in reptiles, birds and mammals It provides a kind of private aquarium to the embryo and protects it from mechanical shock and desiccation. Chorion (serosa) is the outermost extra-embryonic membrane in reptiles, birds and mammals. It surrounds the whole embryonic system of embryo.
Yolk sac contains yolk in reptiles in reptiles and birds. In mammals yolk sac is also known as umbilical vesicle. It is connectrd to enteron of embryo by a slender yolk stalk.
Allantois functions as an embryonic urinary bladder of as a respiratory extension of hind git in reptilrs and birds. In mammals it is modified to carry blood vessels to and from the placenta.
Yolk sac contains yolk in reptiles in reptiles and birds. In mammals yolk sac is also known as umbilical vesicle. It is connectrd to enteron of embryo by a slender yolk stalk.
Allantois functions as an embryonic urinary bladder of as a respiratory extension of hind git in reptilrs and birds. In mammals it is modified to carry blood vessels to and from the placenta.
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