* Outer cells pump Sodium into the intracellular spaces and water follows osmotically.
* Outer cells pump Sodium into the intracellular spaces and water follows osmotically.
* Fluid begins to accumulate within the Morula.
* Fluid begins to accumulate within the Morula.
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[[Image:Pre Implantation Development morula.jpg|right|thumb|250px|<small><center> Schematic showing Development of Distinct Groups of Cells within the Morula. (Courtesy of Pathways to Pregnancy and Parturition, Senger)</center></small>]]
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* Cells of the Morula continue to divide and a '''Blastocyst''' develops, consisting of:
* Cells of the Morula continue to divide and a '''Blastocyst''' develops, consisting of: