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  • vagina 
  • kaylee mchugh and haley bowman
  • I'm finally home, I have to go inside to get to my bed. 
  • cervix
  • Oh I have to go through my living room to get to my bedroom, usually I would sit on the couch, but I would fall asleep and never make it to my room.
  • uterus/uterotubal junction
  • ahhh my parents, I need to make it past them or they will give me chores and I won't make it to sleep.
  • approximately 250 million sperm enter the vagina, most of them die within 30 mins. defenses: sperm destroyed by deadly acids that protect vagina from pathogens. 
  • Fallopian tubes
  • I finally made it past my parents, now I have to make it to the shower before bed. 
  • 60,000 remaining sperm must navigate through the cervix located at the far end of the vagina. Cervix usually plugged shut with mucus to defend against invading pathogens. However, during ovulation, estrogen flows from the ovary to the uterus, which softens the mucus to make it watery so sperm can navigate through. Sperm must swim single file through tiny channels in the cervical canal. Most of them will die because they get stuck or lost in one of the tens of thousands of passageways.
  • fertalization 
  • doorway to the Fallopian tube, sperm that show the proper swimming characteristics are let in.;approximately only 10-30 sperm survive  on e inside sperm are safe from leukocytes  and are provided with nourishment from  the Fallopian tube.
  • implantation
  • Approximately 10-30 sperm remain. Once inside, sperm are safe from attack by Leukocytes. Sperm are provided with nourishment from the Fallopian tube (ph levels, ion concentration stabilize)  so they may stay alive for several hours, even days!
  • The remaining sperm must attempt to find the egg at the upper end of the Fallopian tube. Egg releases chemicals that sperm can sense and they begin to move more quickly. The sperm that makes contacts with "outer coat" of the egg has a bag of enzymes on it head that explodes, which allows it to penetrate the "outer coat" of the egg.
  • Now that I have made it to the shower i'm ready for bed. 
  • the zygote travels down the Fallopian tube toward the uterus, cells begin dividing. on day four the tiny bundle of cells is named blastocyst. five days later the embryo breaks out of the protective shell and implants in the wall of the uterus and begins growing.
  • Now that I've made it to my bed i'm going to sleep for awhile, goodnight.
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