醫學二：100題 ( 包括生理學,生化學,藥理學,病理學等科目及其臨床相關知識 )題庫下載題庫

As  the  fertilizing  spermatozoon  penetrates  the  ooplasm,  at least  three  types  of postfusion  reactions  occur  to  pre­vent other spermatozoa from  entering the  secondary oocyte (polyspermy). These events include the following:Fast  block  to  polysperm y.  A  large  and  long-lasting (up to  1  minute) depolarization of the oolemma creates a transient electrical block to polyspermy.Cortical reaction. Changes in the polarity of the oolemma then trigger release of Ca2+ from the ooplasmic stores. The Ca2+  propagates a cortical reaction wave in which cortical...
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As  the  fertilizing  spermatozoon  penetrates  the  ooplasm,  at least  three  types  of postfusion  reactions  occur  to  pre­vent other spermatozoa from  entering the  secondary oocyte (polyspermy). These events include the following:Fast  block  to  polysperm y.  A  large  and  long-lasting (up to  1  minute) depolarization of the oolemma creates a transient electrical block to polyspermy.Cortical reaction. Changes in the polarity of the oolemma then trigger release of Ca2+ from the ooplasmic stores. The Ca2+  propagates a cortical reaction wave in which cortical g.....看完整詳解