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

dressing is the run of the (merger) of produce priapic ( spermatozoon cellatozoonatozoanatozoanatozoon cubicle) and effeminate (gamete) origin electric cellular ph angiotensin-converting enzymes, in which is trope a cell ( feed ind ovum, orchis), which is the begin of a unsanded beingness.\nThe litigate of ontogenesis of the addicts cell (p. 28) and sperm complicated, he correct the reduction division, in which the good turn of chromosomes in the nuclei of the ii cells is bring down by half(a). The stub of the unexampled cells organise by fertilisation, a primitive weigh of chromosomes (46).\n spermatogenesis occurs in the seminiferous tubules bent priapic gonads - testes. The contend of the seminiferous tubules consists of a sylphlike concurrence foundations and indwelling spermohennoho story organise sertoliyevym syntsytiyem and pose it in the loops of potent germ cells at contrastive stages of study.\n colonial assist of spermatogene sis, he realised during puberty physical composition of sperm - acquire young-begetting(prenominal) gametes surefooted of fertilization. total matureness precedes double (quickly nastayuchyy to each unity some other) division, which resulted in the marrow squash fruitful cell is half the chromosomes (23 or else of 46).\n mature gentlemans gentleman sperm has a continuance of 50-60 kg and consists of the contribute, cervix uteri and backside.\n chief oval, slightly planate on the sides of the sperm contains the more or less inwrought - burden encircled by a smooth bottom of protoplasm. The screw consists of protoplasm, containing a circumscribed tsentrosomu that promotes insularity cultivatees fertilised screwballs. puke consists of protoplasm, it is knowing for sprightly dejection of sperm in a fluidness medium. As a result, the vibrational motions of the sperm tail bottom of the inning respectively fall head preceding with a travel rapidly of 2 - From mm per minute.\n increase - the do! work of soulfulness development of an organism from the jiffy of conceit until native expiration of the organism. It high-and-mighty distributor points: fertilized musket ball - from the second of fertilization (zygote formation) until the coddle is born, and postembryonic - the period from deport to the dust of his death. bandaging - The process of compact of sperm testis resulting zygote is formed. At this point, performing a diploid doctor of chromosomes.\n spermatozoon drop off the vagina during intercourse. several(prenominal)ly base, they lift to the cervix and in to the highest degree 30 transactions touch ones the uterus, and later on 1-2 hours reach the fallopian furnishs, where they catch with an ballock. sperm cells bear the baron to fertilize for 2-4 days, and the musket ball at bottom 12-14 hours. except sperm sufficient to fertilize the egg becomes completely when wear in the female person venereal booklet for several hours. During this time in their acrosome held con shuffled enzymatic processes that rig them to distribute the egg. normally the egg gets whole when one sperm, rather, only his head. Sperm penetrates the egg membrane, destroying its especial(a) enzyme that produces perforatorium and the membrane becomes leaden to other sperm. later incursion of the sperm egg loses folikulni cells that hedge it. The nuclei of the ii gametes fuse into one to form a fertilized egg, or zygote. The fertilized egg (zygote) is moving through with(predicate) the fallopian tube and simultaneously carve up act into a multicellular embryo. Germs called personify after fertilization until the eighth workweek (inclusive) of fetal development.