Biology Questions and Answers
Extraembryonic Membranes...................................................................................................
- What are extraembryonic
membranes?
Extraembryomembranous structures tnic membranes arehat appear in (^)
parallel with the embryo and play
important roldevelopment. They form from thees in the embryonic (^)
embryo but do not become part of the
individual organism after its birth.
- What are the
extraembryonic membranes
present in vertebrates?
The extraembryonic membranes that
may be present iyolk sac, the amnion vertebrates arn, the chorion, thee the (^)
allantois and the placenta.
- Are the extraembryonic
membranes the same in all
vertebrates?
The presence of each extraembryonic
membrane varivertebrate class.es according to the
In fishes asac is present. Ind amphibians only n reptiles and birdsthe yolk
besides the yolk sac there are also the
amnion, the chorion and the allantois.
In placental mammals besides all these
membranes the placenta is present too.- How is the yolk sac formed?
What is the function of the
yolk sac?
The yolk sac is formed from the
covering of the vitellusoriginated from the primitive g by some cellsut.
The yolk sacnourishment source of non-placental stores vitellus, the main
embryos. - Which is the
extraembryonic membrane
whose function is to store
nitrogen wastes of the
embryo? Is this function
present in placental
mammalian embryos?
The allantoismembrane whose function is is the extraembryo to storenic (^)
the excreted matter of the embryo.
In placental mammals the present but it does not exert thatallantois is
function collected by the mother’s body throughsince the embryonic wastes are
the placenta.
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