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Unlike many single celled bacteria, which reproduce through splitting into half and later, developing in to original parent cell , human reproduction depends on male and female reproductive cells, also known as gametes.
Birth Process begins in a sexual mating when male’s erect penis penetrates into female vagina and ejaculates semen, which contains sperms, into it. Vagina connects vulva, the outer portion of female sex organ, to uterus, where a female egg is fertilized by one out of the million sperm cell released by the penis.
The fertilized egg, zygote, grows by splitting into half cells, both of which divides again and again multiplying the number of cells until the zygote becomes an embryo, which is the earliest shape of a developing child.
The embryo receives its nutrients through umbilical cord blood, which on one end is attached to its abdomen, while the other end is attached to the wall of the female’s womb.
Organ development occurs during subsequent months and the child comes to life after 4 months.
On average, it takes around 9 months for an embryo to develop into a complete child after which labor occurs. Labor is a process, in which the female’s pelvic muscles contracts until the child is ejected out of the vagina.
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Males reproductive organ:
Male s sperms are produced in its sexual organs, testicles, located around the pelvic region. The growth cells are produced here under a controlled environment before they are ejected out of the penis in mating.
Female reproductive organ:
Female egg cells are produced in ovaries, which then come down through uterus , being penetrated and fertilized by sperms.
Another organ, though not directly active in a child birth, are female’s breasts. Mammary glands in breast work as milk secretion hormones and are used to feed child after birth for a couple of years.