The formation of the fertilization envelope requires an increase in the cytosolic concentration of calcium ion .
The process of union of a haploid male gamete or sperm with a haploid female gamete or ovum to form a diploid cell ,zygote ,is called fertilization .
In human fertilization is internal as it takes place in the fallopian tube .
During coitus male discharge sperm to the vagina of the female , from the vagina sperm reach the ampulla partly by the movement of their tails and partly by the action of uterus .
After completing this long travels sperm reaches the fallopian tube within five minutes .
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