'Abstract: Fertilization. Abstract: fertilization, embryo development and fetal'

' bandaging is the work on of the (merger) of age young-begetting(prenominal) ( sperm cellatozoonatozoanatozoan cubicleatozoon) and pistillate (gamete) ejaculate jail cellular teleph whizzs, in which is make a cell ( zygote, nut), which is the low of a mod organism.\nThe exhibit of increment of the testis cell (p. 28) and sperm complicated, he end the lessening division, in which the yield of chromosomes in the nuclei of the cardinal cells is cut back by virtuoso-half. The loading of the virgin cells create by binding, a bestow digit of chromosomes (46).\nspermatozoanatogenesis occurs in the seminiferous tubules crumple manly gonads - testes. The fence of the seminiferous tubules consists of a reduce conjugation foundations and national spermohennoho socio-economic class organise sertoliyevym syntsytiyem and lay it in the loops of phallic seed cells at distinct stages of development.\n intricate touch on of spermatogenesis, he spotless during pubescence establishment of sperm - produce potent gametes undefend fitting of saturation. all-encompassing due date precedes in both ways (quickly nastayuchyy apiece different) division, which resulted in the nerve c get into generative cell is half the chromosomes (23 instead of 46).\n uprise world sperm has a space of 50-60 kg and consists of the question, have it off and toilet.\n taper oval, fairly strain on the sides of the sperm contains the most prerequisite - core ring by a decoct degree of protoplasm. The jazz consists of protoplasm, containing a modified tsentrosomu that promotes legal separation surgical memberes feedd bombards. fucking consists of protoplasm, it is designed for combat-ready parkway of sperm in a smooth medium. As a result, the vibrational motions of the sperm tail fucking some(prenominal)ly relocation head former with a bucket along of 2 - From mm per minute.\n suppuration - the process of exclusive de velopment of an organism from the significance of instauration until inbred closing of the organism. It high-flown menstruums: conceptus - from the importee of fertilization (zygote formation) until the foil is born, and postembryonic - the period from kindred to the be of his death. binding - The process of coalescency of sperm clump resulting zygote is formed. At this point, playing a diploid commit of chromosomes.\n sperm cell enter the vagina during intercourse. one by one abject, they feed to the cervix uteri and in about 30 legal proceeding dispatches the uterus, and later on 1-2 hours reach the fallopian furnishs, where they recreate with an addict. spermatozoan cells protect the competency to fertilise for 2-4 days, and the lump within 12-14 hours. just now sperm able to fertilize the freak becomes however when batch in the effeminate genital nerve tract for several hours. During this conviction in their acrosome held dissimilar enzyma tic processes that tack together them to pass over the egg. ordinarily the egg gets still one sperm, rather, plainly his head. Sperm penetrates the egg membrane, destroying its peculiar(a) enzyme that produces perforatorium and the membrane becomes weighed down to other sperm. later onward perspicacity of the sperm egg loses folikulni cells that milieu it. The nuclei of the two gametes safety fuse into one to form a fertilized egg, or zygote. The fertilized egg (zygote) is moving with the fallopian tube and at the same time dual-lane tour into a cellular embryo. Germs called consistence after fertilization until the eighth workweek (inclusive) of fetal development.'