Human developement notes 4

Human developement notes 4 - Birth Conception Ovulation...

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Prenatal Development         and  Birth
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Conception Ovulation At least one ovum is released during the menstrual  cycle. Average cycle is ______28 days_______. Women ovulate around 13 times a year. Equates to ____481____ ova in 37 years of reproduction. Spermatogensis How sperm develops. ___100____ sperm produced per second. It takes 72 days to produce a mature sperm cell  (spermatozoa). Lots of sperm are released during ejaculation  200-500 million
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Fertilization Ova must be fertilized by sperm within ____24-48  hours_____ after ovulation.  Out of the millions of sperm release, only 100-1,000 reach  the egg. The journey to the ovum eliminates the genetically weak  sperm. Sperm is viable for about                                                                           __3 days______. Fertilization officially                                                            happens when a sperm                                                        penetrates the outer                                                           layer of an ovum.
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Conception and Implantation
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Stages of Prenatal Development Germinal Stage  from conception to implantation Around 2 weeks. Embryonic Stage  implantation to 8 weeks Most critical time in development  Major organs develop Fetal Stage  8 weeks to birth Further development of organs. Rapid brain development.
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Germinal to Embryonic Stage Amnion Membrane that grows over the embryo.  fills with amniotic fluid Provides shock-absorbing protection                                                   for the embryo. Chorion Grows around the embryo after 1 month. Helps form the ______placenta________. Placenta The mass through which nutrients and waste are  exchanged.
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