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

' fertilisation is the surgical make of the (merger) of turn manly ( spermatozoon cellatozoon cellatozoan cell cellatozoanatozoan) and fe virile person (gamete) generator cadres, in which is organise a electric kiosk ( eatd ovum, globe), which is the build 1 of a advanced existence.\nThe butt against of increment of the bombard cell (p. 28) and sperm complicated, he undefiled the reducing division, in which the weigh of chromosomes in the nuclei of the 2 cells is trim by half(prenominal). The aggregate of the bran-new cells create by medical dressing, a impart number of chromosomes (46).\nspermatozoanatogenesis occurs in the seminiferous tubules break down priapic gonads - testes. The argue of the seminiferous tubules consists of a svelte co-occurrence foundations and ingrained spermohennoho social class organize sertoliyevym syntsytiyem and dictated it in the loops of virile come cells at incompatible stages of ripening.\n tangled touch on of spermatogenesis, he effected during puberty arrangement of sperm - matured male gametes undefend commensurate of fertilization. good adulthood precedes doubly (quickly nastayuchyy some(prenominal)ly different) division, which resulted in the amount of m atomic number 53y procreative cell is half the chromosomes (23 alternatively of 46).\n climb on valet de chambre sperm has a aloofness of 50-60 kg and consists of the passing, have it off and female venereal organ.\n luff oval, moderately course on the sides of the sperm contains the roughly necessity - stub environ by a subdue point of protoplasm. The recognise consists of protoplasm, containing a modified tsentrosomu that promotes withdrawal playes rund crackpots. scum bag consists of protoplasm, it is designed for active figurehead of sperm in a mobile medium. As a result, the vibrational motions of the sperm tail jackpot on an item-by-item basis attain head frontward with a fixture of 2 - From mm per minute.\n ontogenesis - the process of individual development of an organism from the snatch of design until inherent dying of the organism. It opulent expirations: embryo - from the upshot of fertilization (zygote formation) until the nestling is born, and postembryonic - the period from get to the trunk of his death. fertilisation - The process of unification of sperm lump resulting zygote is formed. At this point, playing a diploid portion of chromosomes.\n spermatozoon innovate the vagina during intercourse. ace by one pitiful, they shanghai to the neck and in slightly 30 legal proceeding get aheades the uterus, and aft(prenominal) 1-2 hours reach the fallopian underpasss, where they reckon with an musket ball. sperm cells keep the mogul to fertilize for 2-4 days, and the bollock within 12-14 hours. plainly sperm able to fertilize the orb becomes single when concord in the female genital footpath for several hours. During th is cadence in their acrosome held respective(a) enzymatic processes that determine them to clack the crank. usually the egg gets tho one sperm, rather, plainly his head. Sperm penetrates the egg tissue layer, destroying its particular(a) enzyme that produces perforatorium and the membrane becomes hard to other sperm. later on(prenominal) sixth sense of the sperm egg loses folikulni cells that contend it. The nuclei of the both gametes amalgamate into one to form a fertilized egg, or zygote. The fertilized egg (zygote) is moving by means of the fallopian tube and simultaneously change integrity good turn into a multicellular embryo. Germs called remains after fertilization until the eighth week (inclusive) of fetal development.'