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【简答题】
（1）生殖细胞：睾丸产生的___________和卵巢产生的______________。 （2）过程：卵子发育成熟后，由卵巢排出，进入_____________，若在输卵管里与一个__________相遇，两者就结合完成受精作用。 （3）受精作用：_____________和_________结合的过程。 （4）受精卵：由卵子和精子结合而成的_________________________。 （5）常用的节育方式：结扎_________或________能有效地阻碍精子和卵子的结合，且不影响__________和__________的正常生理功能。 （6）思考：卵子一般每月只有一个发育成熟，而睾丸产生的精子很多，它们如何结合成一个受精卵？
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