Select the changes in the embryo that indicate that a blastocyst has formed.
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two different groups of cells have formed
cleavage has formed creating a morula
there is a hollow structure, with a mass on the outside and a trophoblast on the inside
many different groups of cells have formed
morula can implant itself into the wall of the uterus and becomes a blastocyst
there is a hollow structure, with a trophoblast on the outside and a inner mass on the inside
You can identify that a gastula has formed because you should note the presence of
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the endoderm
all primary germ layers
the ectoderm
Select all the correct statements.
Question options:
In birds, placenta develops from the chorion and extends into the uterine lining.
In humans, placenta develops from the chorion and extends into the uterine lining.
In humans, the placenta (originating from the chorion) allows for the exchange of oxygen and metabolic wastes.
In birds, the placenta (originating from the chorion) allows for the exchange of oxygen and metabolic wastes.
In birds, the chorion is involved in gas exchange
In humans, the chorion is involved in gas exchange
In birds, the chorion combines with the allantois (an extra-embryonic membrane) rather than with the mother’s tissues
In humans, the chorion combines with the allantois (an extra-embryonic membrane) rather than with the mother’s tissues
the mesoderm
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