2. when men ejaculate semen into the vagina of the female Department.
Is a sperm directly into the uterus and fallopian tubes to the uterus, and wings.
Normal sperm will travel with a rate of 2-3 mm per minute, but slow-moving sperm in the vagina with an acid condition and moving faster when accessing from the cervix. Go in the uterine cavity with alkalinity, which over the past into nest it. 400-500 million sperm count while ejaculation will survive only a few hundred have the opportunity to mix the eggs.
The header of the sperm to release a substance (Enzyme), which can melt the wall that protects the egg wrapping removed.
And there will be only one sperm penetrating into eggs successfully. The other sperm would not be able to access it again.
Then the salad, and the sub headers to liberate all 23 chromosome rods contained within headers into the egg to pair itself with 23 chromosomes of the rods in the egg.
And fusing together became a single cell called a birth up.