Human Reproduction

Hello, there, I've just read a book, and the pictures 'ask' me to explain it to you. I'm going to explain about reproduction.

Well, reproduction is a 'remaking process' (I saw it in dictionary!). But in biological context, reproduction means biological process by which new individual organisms are produced.

But before I tell you the process, I'm going to mention the organs those are involved.

Alright, from the male side, we have testis, a couple of gland that produces sperm and testosterone. Testosterone is a hormone that is stimulating ejaculation (if I'm not mistaken... CMIW). And ejaculation is done by penis. it spray semen that is consist of hundred thousands of sperms. But before the sperms reach penis, they have to pass the epididimis and tubulus somniferous.




And from the female side, we have Ovaries, a couple of glands that produces and eggs (ovum), progesterone and estrogen. Those hormones in collaborate with Follicle Stimulating Hormone and Luteinizing Hormone will activate the cycle of menstruation. Menstruation it is a cycle when women get blood from their vagina. Alright, too vulgar, I guess. But sorry, I don't have any suitable words. Beside produce those hormones, Ovaries also produces eggs in a cycle like menstruation called ovulation. Before reach the vagina, the eggs pass the oviduct, uterus and then cervix.




And now, how reproduction can make an egg into a real human? Don’t stop to read this posting!
In a process of copulation, penis sprays semen into vagina and the sperms 'swim' to get the egg. However which sperm find the egg first, will win. I mean after the first sperm get into the egg, the egg will make a layer that's impenetrable for twice. After the sperm get into the egg, their nucleuses are integrating. That integrated-nucleus cell cleaving into blastula, morula, and then gastrula (CMIW again...). Finally the cleaved cells forming a cave that divide into three layers: ectoderm, mesoderm and endoderm. Those layers differentiate into functional organs such as brain, heart, bones, etc. after the growing process of nine months, those organs develop and they synergize into system organ and then they form an organism.

Guys, the living things do the reproduction to extend their line of descent (uuh.. I can’t find the right diction for biological context).

Well, guys, I think that's all from me. Is it clear enough? No? Okay, you can open other sources. But once again, if you find something wrong about this posting, correct me doubtlessly. Thank you! ^^