Human Fertilization

Sperm and Ova (Spermatozoa and Oocytes) Human Reproductive Cells Humans reproduce depend onually, with both(prenominal) p arnts contributing half of the genetic makeup of their result via sex cells or gametes. Gametes produced by the male p arnt be called spermatozoan cellatozoa (commonly called sperm cells), and effeminate gametes are Oocytes (commonly referred to as ova or eggs). As gametes are formed, the 46 chromosomes from from each cardinal evoke cell (23 pairs of chromosomes) are sepa locate through meiosis so that each gamete is haploid, having only 23 unpaired chromosomes. Spermatozoa, produced by males, extend a twenty-third chromosome that is any an X chromosome (female) or the homogeneous Y chromosome (male), making each sperm cell all female or male. Spermatozoa ache a head that contains a magnetic core, a mid morsel that contains mitochondria, and a croupe with its end piece. Female spermatozoa have bigger heads than their male complements , and as a result, are slower swimmers. Spermatozoa swim via the rotational style or flagellating of a tail, and move through chemotaxis into contact with the oocyte where one spermatozoan fertilizes the egg, thereby creating a zygote. Oocytes are also haploid, and since they are formed only by females, the 23rd chromosome put forrader only be an X chromosome.

Each oocyte is protect by several layers of granulosa cells called the corona radiata. Beneath the corona radiata lays the geographical regularise pellucida which is involved in binding the sperm cell, and through which the sperm cell must also penet score prior to fertilization. The gist in an oocyte is called the germina l vessicel, and the nucleolus is referred to! as the germinal spot. Facts to the highest grad Gametes - Spermatozoa are about 55 micron long: 5 micron head + 50 micron tail . - Spermatozoa discount live up to roughly 72 hours within the female reproductive system. - Spermatozoa can move at a rate of about 2mm/minute unassisted, with mobility being greatly aided by contractions of the female uterus and fallopian...If you want to get a lavish essay, order it on our website: OrderEssay.net

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