Biology Questions and Answers
- Why can the allantois be
considered an adaptation to
terrestrial life?
The allantoisland because is an adaptationin embryos of oviparous to dry (^)
terrestrialthe metabolic beings, like residuals cannot bereptiles and birds,
immediately excreted to the aquatic
surrounds (as fishlarvae do). It was necessary then fores and amphibian (^)
the appearance of a structure capable of
storing the embryonic excretes uhatching. ntil
- What is the difference
between amnion and chorion?
Amnion is the membrane that covers
the embryo. that covers the amnion, Chorion is ththe yolk sace membrane
and the allantois. The space delimited
by the chorioamniotic cavityn and the amnion is called and it is filled with
aminiotic fluid. The amniotic cavity has
the functions oof the embryo and of protecting itf preventing desiccation
against mechanical shocks.
- Why can the amnion also be
considered an adaptation to
terrestrial life?
The amnion is also an adaptation to land since one of its functions is to dry
prevent desiccation of the embryo.
- What is the chorioallantois
membrane present in the
embryonic development of
reptiles and birds? How does
this membrane participate in
the energetic metabolism of
the embryo?
The chorioallantois membrane is formed
by juxtachorion apositionnd the allantois. of some r Since egions of theit is
porous, the chorioallantois membrane
allows ththe embryo e passagand the exterior thuse of gases between
making aerobic cellular respiration
possible. - In which type of animals
does the placenta exist? What
is its main function?
True placenta is present in placental
mammals.
The placenta is formed from thof the embryo and from the mother’se chorion
endometrium. Its main function is to
allow thbetween the fetus ae exchange of substancesnd the mother (^) ’s
body.
- What are the main
substances transferred from
the mother to the fetus
through the placenta? And
from the fetus to the mother?
From the mother transferred substancesto the fetus the through themain
placenta are water, oxygen, nutrients
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