fertilisation is the joining together - of the sperm and egg, the sperms swim through the cervix, up the uterus - and into the egg tube to find the egg, this is a very long way for the sperm to swim - and most of them will not reach the egg, to overcome these losses millions of sperm - are released into the vagina at once, a number of sperms may reach the egg - but only 1 is able to enter it, this is because the egg makes a skin around itself - to stop other sperms from entering, the egg can live for about a day - and a sperm can live up to 3 days, there are only about 3 days in a month - when it is possible for the egg to be fertilised,

fertilisation process match up

アノニマスさんの投稿です
印刷
埋め込み

リーダーボード

表示スタイル

オプション

テンプレートを切り替える

自動保存: を復元しますか?