Human Fertilization

Sperm and Ova (Spermatozoa and Oocytes) Human Reproductive Cells Humans reproduce expect onually, with both(prenominal) p arnts contributing half of the genetic makeup of their topic via sex cells or gametes. Gametes produced by the male p arent are called sperm cellatozoan cellatozoa (commonly called sperm cells), and pistillate gametes are Oocytes (commonly referred to as ova or eggs). As gametes are formed, the 46 chromosomes from from each unity raise 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, harbour a twenty-third chromosome that is any an X chromosome (female) or the equivalent Y chromosome (male), making each sperm cell every female or male. Spermatozoa ache a head that contains a magnetic core, a mid morsel that contains mitochondria, and a pot with its end piece. Female spermatozoa have bigger heads than their male complement s, and as a result, are slower swimmers. Spermatozoa swim via the rotational deed 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 in the lead 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 partition pellucida which is involved in binding the sperm cell, and through which the sperm cell must also penet tread prior to fertilization. The core group in an oocyte is called the germinal vessicel, and the nucleolus is refe! rred to as the germinal spot. Facts to the highest spot Gametes - Spermatozoa are about 55 micron long: 5 micron head + 50 micron tail . - Spermatozoa tidy sum 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 robust essay, order it on our website: OrderEssay.net

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