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Chapter 6

Chapter 6 Conception

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Western University
Psychology 2075
Michelle Everest

Chapter 6 Conception Sperm meets Eggy Ovulation Day 14o Released into bodyo Then picked up by fimbriae long fingerlike structures at the end of the fallopian tube and enters fallopian tubeo Reaching uterus in 5 days if it has been fertilizedo Otherwise it disintegrates in about 48 hourso Propelled by cilia hairlike structures lining fallopian tubey The cervix secretes mucus that flushes the passageways to prepare for the arrival of spermy Sperm is ejaculated inside vaginao Initially sperm has long trip manufactured in seminiferous tubules of the testes collected and stored in the epididymis during ejaculation move up and over top of the bladder in the vas deferens then they travelled down through the ejaculatory duct mixed with seminal fluid and went through the urethray Sperm is composed of head midpiece and tailo Head contains DNA and acrosome the chemical reservoiro RNA carrying the instructions of for each embryonic development and proteinso Midpiece mitochondria tiny structures in which chemical reactions occur that provide energythe energy is used for flagellation propels sperm forward by lashing tail back and forthy200 million sperm are ejaculated o Most do not make it fall out of vagina due to gravity killed by acidity deformed swim up wrong tubeo Capable of swimming 13cmhoury Conception occurs in outer third of fallopian tubeo Only about 2000 sperm reach the tube containing the eggo As they approach a chemical secreted by egg attracts the spermo The egg is surrounded by a thin gelatinous layer called zona pellucidao Sperm swarm around the egg and secret an enzyme called hyaluronidase produced by the acrosome this enzyme dissolves the zona pellucida permitting one sperm to penetrate the egg o Conception occursy Zygote fertilized eggo Zygote the developing organism form the time of the union of the sperm that allows one sperm to penetrate the eggo Continues to travel down fallopian tubey Cell divisiono After 36 hours after conception starts cell division by which the original one cell becomes a mass of two cells four eight and so on y Implantationo About 57 days after conception the mass of cell implantso To be nourished and growy For first 2 weeks of gestation called zygotey 28 weeks called embryoy 8 weeks to birth called fetusImproving the chances of conception making a baby y Having intercourse around ovulationy Ovulation can be determined by keeping a basal body temperature chart o Checks temperature when wake up dailyo There is a rise in temperature the day after it occursy Sperm can live in a womans body up to 5 days after y The egg is capable of being fertilized for about the first 1224 hours after ovulationy Therefore intercourse should be timed right at ovulation or one or two days beforey Maintaining a high sperm count is important in accomplishing the task of fertilization so not always more the merrier y Best to have intercourse every 2448 hours 4 times that weeky Best position is missionary after remaining on her back possibly elevating her legs y Due to sensitivity of pH do not use lube may kill or block spermDevelopment of conceptusy In the past the relationship between fetus and motherharmoniousy Today seen as more competition for nutrientso Struggle explains aspects that are inconsistent with harmony rdo Ex gestational diabetes and preeclampsia 3 triblood pressure presence of protein in urine swelling of limbs and facey Both undergo parallel dynamic changes The embryo and its support system28 weeksy Major organ development y The inner ball of cells implanted in uterus now differentiates into 2 layers o 1 Endoderm differentiates into the digestive system and respiratory systemo 2 Ectoderm will form the entire nervous system and skino Later on 3 Mesoderm forms between the 2 muscles skeleton connective tissues reproductive and circulatory systemy Generally development proceeds in cephalocadual orderhead is first this is why it is so large at this stagey Trophoblast another group of cells that has differentiated o Important functions in maintaining the embryo and which will eventually become the placenta o lacenta an organ formed on the wall of the uterus through which the fetus received oxygen nutrients and gets rid of waste
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