Only one sperm cell unites with the ovum, penetrating the follicular cells and a layer called the ________ ________, which surrounds the cell membrane of the ovum.
Fill in the blank(s) with the appropriate word(s).
zona pellucida
Although many sperm cells normally reach an ovum, only one sperm cell unites with the ovum, penetrating the follicular cells and a layer called the zona pellucida, which surrounds the cell membrane of the ovum.
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