Essay on Human Fertilisation and Development

1103 Words Jun 5th, 2013 5 Pages
Human Fertilisation and Development
Each day cute little babies are born into this world and being dazzled by their beauty we forget all about the long complicating process that took place which made it possible to have a baby. Therefore in my essay I am going to discuss the human reproductive cell, fertilisation and the development of a human life.
Humans reproduce sexually, with both parents contributing half of the genetic makeup of their offspring via sex cells or gametes. Gametes produced by the male parent through Spermatogenesis process are called spermatozoa (commonly called sperm cells) and gametes produced by females through Oogenesis process are called oocytes (commonly referred to as ova or eggs). As gametes are formed, the 46
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The nucleus in an oocyte is called the germinal vessicel, and the nucleolus is referred to as the germinal spot. Eggs are produced in the ovaries, oval-shaped organs in the groin that also generate sex hormones. At birth, a female's ovaries contain hundreds of thousands of undeveloped eggs, each surrounded by a group of cells to form a follicle, or sac; however, only about 360-480 follicles reach full maturity. During puberty the action of hormones causes several follicles to develop each month. Normally, just one follicle fully matures, rupturing and releasing an ovum through the ovary wall in a process called ovulation. The mature egg enters one of the paired fallopian tubes, where it may be fertilized by a sperm and move on to the uterus to develop into a fetus. The lining of the uterus, called the endometrium, prepares for pregnancy each month by thickening, but if fertilization does not take place, the endometrium is shed during menstruation.
The development of a human begins with fertilization, a process by which the spermatozoan from the male and the oocyte from the female unite to give rise to a new organism, the zygote. During sexual intercourse, a man releases approximately 300 million sperm into a woman's vagina, but only one of the sperm can fertilize the ovum. The successful sperm cell must enter the uterus, swim up the fallopian tube to meet the ovum, and then pass through a thick…

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