The Glorious Qur'an mentions no less than eleven times that the human being is created from nutfah, which means a minute quantity of liquid or a trickle of liquid which remains after emptying a cup. This is mentioned in several verses of the Qur'an including 22:5 and 23:13 (The same is also mentioned in the Qur'an in 16:4, 18:37, 35:11, 36:77, 40:67, 53:46, 75:37, 76:2 and 80:19).
Science has confirmed in recent times that only one out of an average of three million sperms is required for fertilizing the ovum. This means that only a 1/three millionth part or 0.00003% of the quantity of sperms that are emitted is required for fertilization.
(from "The Quran and Modern Science, Compatible or Incompatible?" by "Dr. Zakir Abdul Karim Naik" published by Darussalam)