human reproduction
DESCRIPTION
anatomy, reproduction, powerpointTRANSCRIPT
-
Human Reproduction
-
Battle of the sexes!!!Are males and females all that different?Well..YesAndNo!
-
Anatomy
MaleFemale
-
Similarities2 pouchesTesticlesOvariesStart out inside bodyTesticles descend before birthFetus begins with starter parts that could develop into either gender.
-
Around 7th WeekBabys body is told by DNA to become either male or female.Unused parts disintegrateUsed parts continue development(see overhead)
-
Male or Female???DNA determines babys genderXX = FemaleXY = MaleDepends on which egg & sperm get together.Father determines babys gender.
-
Anatomy similaritiesFunction VERY different!MaleUncomplicatedProduce sperm2-4 MILLION every dayFemaleVery Complicated!One eggOnce a monthCareful coordination of hormones & bodyTiming perfect!
-
FemalesOvaries2 pouchesContain ovaBorn with all of her eggs (~ 400,000)Use up ~500Wont run out!OvulationOne egg released from ovary to oviduct (fallopian tube)
-
After OvulationEgg pushed along by ciliaFew days travel time to arrive in uterus
Cervix Opening between uterus & vaginaNormally tinyAt birth muscles pull open (dilation) cervix to allow baby to pass through = Labor
-
Menstrual CycleComplex combination of 10-12 chemicals (hormones)Usually one egg once a monthAll about timing!!!Uterus must be ready when egg gets there in case it was fertilizedIf no fertilization, tear down lining of uterus and rebuild for next month
-
28-Day Cycle (average)Three StagesTear DownRebuildExtra nutrients/blood for potential baby
No Baby?Back to #1
-
Chemicals (hormones)Regulate events in the bodyEstrogenProgesteroneLH (leuteinizing hormone)FSH (follicle stimulating hormone)Many others
-
Day 1First menstrual blood & tissueNo baby = breaks down lining of uterus5-7 days of blood/tissue exits bodyPre-Ovulation
-
~Day 14Ovulation = Egg releasedTemp spikes slightlyMost fertile in next few days!Able to get pregnantEgg gets fertilized while traveling through oviduct.Post-Ovulation
-
If fertilizedZygote begins to divide as it travels through oviductImplants into lining of uterus
-
If not fertilizedEgg travels through oviduct to uterusExits body with blood and tissues during menstruation
-
Birth Control PillsTrick body into thinking its pregnantExtra hormonesNo ovulation occursNo ovulation = no egg = no fertilization = no baby!No hormones taken for 7 days = menstruation
-
MaleTestesProduce 2-4 million sperm every day Outside body why?Sperm like temps 1-2 cooler than body tempVas DeferensTube sperm travel throughVasectomyCut/tie off tube sperm cant get out!