10 Questions
What is the arrangement of cells in the blastoderm?
Two layers, the epiblast and hypoblast, enclosing a fluid-filled cavity
What type of cleavage occurs in species with little or moderate amounts of yolk, such as sea urchins and frogs?
Holoblastic cleavage
In mammalian cleavage, what is the process that results in a compact blastomere structure?
Compaction
What is the primary function of the trophoblast cells in mammalian embryonic development?
Form the placenta (chorion) to enable nutrient and oxygen exchange
What is the structure that develops from the inner cell mass of the blastocyst?
The embryo and extraembryonic membranes
What facilitates the implantation of the blastocyst in the uterus?
The trophoblast secretes enzymes
What process begins after the completion of implantation in human embryonic development?
Gastrulation
What is the structure formed by the inner cell mass after implantation?
A flat thick disk with an upper epiblast and a lower hypoblast
Which of the following statements about mammalian cleavage is incorrect?
Trophoblast cells participate in forming the embryo
What is the primary function of the blastocoel in early embryonic development?
To provide a fluid-filled cavity for the developing embryo
Learn about the process of cleavage in sea urchin development, including the formation of blastomeres, blastula, and blastocoel. Explore the stages from fertilized egg to the four-cell stage.
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