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is there a exchange of cells between the mother and the fetus through the placenta under normal conditions there is not a passage of cells across the
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 to the
in which type of animals does the placenta exist what is its main functiontrue placenta is present in placental mammalsthe placenta is produced from
why can the amnion also be considered an adaptation to terrestrial lifethe amnion is also an adaptation to dry land since one of its functions is to
what is the difference between amnion and chorionamnion is the membrane that covers the embryo chorion is the membrane that covers the amnion the
why can the allantois be considered an adaptation to terrestrial lifethe allantois is an adaptation to dry land because in embryos of oviparous
what are the extraembryonic membranes present in vertebrates the extraembryonic membranes that might be present in vertebrates are the yolk sac the
which is the extraembryonic membrane whose function is to store nitrogen wastes of the embryo is this function present in placental mammalian
how is the yolk sac formed what is the function of the yolk sacthe yolk sac is formed from the covering of the vitellus by some cells originated from
are the extraembryonic membranes the same in all vertebratesthe presence of each extraembryonic membrane varies according to the vertebrate classin
what are extraembryonic membranesextraembryonic membranes are membranous structures that appear in parallel with the embryo and play significant
what is polyembryonypolyembryony is the phenomenon in which a single embryo in its initial embryonic stage separates itself forming many new
what are twins genetically what are the two types of twins that can be generatedtwins are simultaneously generated within the mothers uterus
from which germ layer do the epidermis and the nervous system originate what are other organs and tissues made from that germ layerepidermis and
what are histogenesis and organogenesishistogenesis is the procedure of tissue formation in the embryonic development organogenesis is the process of
what are pleura pericardium and peritoneumpleura are the membrane that hides the lungs and the inner wall of the chest pericardium is the membrane
what is the coelom to which structures do coeloms give birth are all animals coelomatecoeloms are cavities delimited by mesoderm coeloms create the
what is the notochord how is this structure formedthe notochord is a rodlike structure that produces the supporting axis of the embryo and gives
how does the embryo turn from gastrula into neurula how is the neural tube formed what is the embryonic origin of the nervous system in
what are the archenteron and the blastopore what is the stage of the embryonic development in which these structures are formed what are the
what is gastrulation how during gastrulation are the first two germ layers formed what are these germ layersgastrulation is the process by which a
what are the cells produced in the first stage of the embryonic development calledthe cells that result from the cleavage the first stage of the
what is the cell division during the first stage of the embryonic development called how is this stage characterized the cell division in the first
what are the four initial stages of the embryonic developmentthe four initial parts of the embryonic development are the morula stage the blastula
what is the cell division process directly related to the embryonic growththe embryonic growth depends directly on mitosis by this type of cell