Human Reproduction
Transcript of Human Reproduction
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Human Reproduction
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Around 7th Week…Baby’s body is “told” by DNA to become either male or female.“Unused” parts disintegrate“Used” parts continue development
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Male or Female???DNA determines baby’s genderXX = Female Chromosome XY = Male ChromosomeDepends on which egg & sperm get together.Father determines baby’s gender by contributing an X or Y. Mother can only contribute an X.
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Anatomy – similaritiesFunction – VERY different!
MaleUncomplicatedProduce sperm
2-4 MILLION every day
FemaleVery Complicated!One eggOnce a monthCareful coordination of hormones & bodyTiming perfect!
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FemalesOvaries
2 pouchesContain ova
Born with all of her eggs (~ 400,000)Use up ~500Won’t run out!
Ovulation- One egg released from ovary to fallopian tube Hyperovulation- more than one egg released from ovary to fallopian tube
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After OvulationEgg pushed along by ciliaCan be fertilized in the fallopian tube and is viable for 12-24 hoursFew days travel time to arrive in uterus
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Menstrual CycleComplex combination of 10-12 chemicals (hormones)Usually one egg once a monthAll about timing!!! Sperm can live up to 5 days in the female’s body. An ovum is only viable for 12 to 24 hours. A woman can get pregnant anytime from about five days prior to ovulation to even occasionally two days after, for a total of about seven days.
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
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28-Day Cycle (average)
Three Stages1. Tear Down2. Rebuild3. Extra nutrients/blood for potential
baby
No Baby?Back to #1
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Chemicals (hormones)Regulate events in the body
EstrogenProgesteroneLH (leuteinizing hormone)FSH (follicle stimulating hormone)Many others
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Day 1First menstrual blood & tissueNo baby = breaks down lining of uterus5-7 days of blood/tissue exits body
Pre-Ovulation
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~Day 14Ovulation = Egg releasedTemp spikes slightlyMost fertile in next few days!
Able to get pregnant- while egg is traveling in the fallopian tube.
Egg gets fertilized while traveling through oviduct.Technically, ovulation takes place two weeks before the onset of the next period.
Cycles can differ and women’s cycle length differs
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If fertilized…Zygote begins to divide as it travels through fallopian tubeImplants into lining of uterus
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If not fertilized…Egg travels through the fallopian tube to uterusExits body with blood and tissues during menstruation
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MaleTestes
Produce 2-4 million sperm every day Outside body – why?
Sperm like temps 1-2 cooler than body temp
Vas DeferensTube sperm travel through
Vasectomy (medical procedure)Cut/tie off tube – sperm can’t get out!
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SemenContains
300-500 million spermSperm foodpH buffers
Allows sperm to survive for a couple of days inside female’s body 3-5 days(hostile environment)
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Sperm….Several Parts:
HeadChemical to dissolve egg shellDad’s genetic information (DNA)
MitochondriaEnergy
TailSwimming / propulsion
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Prostate GlandAdds non-sperm stuff to semen
pH buffersNourishment
Prostate CancerSlower-growing (usually)Surgery for removal
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Conception/FertilizationEjaculation
Release of 300-500 million sperm
Egg needs to be in the fallopian tubeSperm to egg, not an easy task
Go wrong direction : 2 paths – only 1 leads to an eggGet attacked by female’s white blood cellsAcidic environmentTiming
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Once egg is located…
Dissolve protective coating surrounding the eggOne gets through – enters eggInstant biochemical change in zygote
No more sperm allowed in
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Zygote begins development
The united egg and sperm is called zygote.
Within 36 hours, while the zygote is still traveling through the fallopian tube, it
begins to divide.
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The BlastocystFrom the two-cell stage until about nine weeks after fertilization, the growing structure is called embryo. About 5 days after fertilization, the embryo reaches the uterus. By this time it is made up of about 500 cells.
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Implants in uterine lining
Endometrium= outer lining of uterusBecomes placenta
Uses mother’s nutrientsContinues development
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Healthy PregnancyPrenatal Care: monitoring toolsProper nutritionPrenatal vitaminsExerciseAvoiding alcohol and drugsAvoiding environmental hazards (x-rays, lead, mercury, cat litter)
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Fetal DevelopmentAmniotic Sac: Soon after implantation, a fluid filled bag of thin tissue develops around the embryo. The sac continues to grow in size as the embryo grows.Inside the sac is amniotic fluid. “water breaking”
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Placenta
• Lines part of the wall of the uterus during pregnancy and nourishes the embryo with substances from the mother’s blood. (oxygen, nutrients, etc)
• Dangerous substances can pass between mother to baby too. (alcohol, drugs, chemicals)
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Umbilical Cord– About 25 days after fertilization, a
cordlike structure develops between the embryo and the placenta.
– Blood vessels from placenta to baby– Mom’s & baby’s blood do not circulate
together!• Can have 2 different blood types• Diffusion
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Growing Fetus• From the 3rd month until birth the baby
is called a fetus.• During the 3rd to 6th month, the fetus begins to move
and kick. (nervous system matures, sense organs develop, and the fetus becomes sensitive to light and sound, fetus alternates periods of activity and sleep)
• During the seventh to ninth month, the fetus continues to grow and develop. The size of the body increases and body fat accumulates.
• By 40 weeks, the fetus is ready to be BORN!
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Stages of Birth• Labor• Contractions begin• Cervix begins to dilate and efface• Contractions every five minutes
and lasting 40 to 60 seconds • Early labor ends around 4 cm
dilated
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Stages of Birth• Transition & Delivery• Cervix dilates from 8 to a full 10
centimeters • This is the most intense part of labor. • Contractions are strong, coming
every two and a half to three minutes or so and lasting a minute or more
• Time to “push”
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Stages of Birth • Delivering the afterbirth• Minutes after giving birth, your
uterus begins to contract again.• The first few contractions usually
separate the placenta from your uterine wall.
• Nurses gently push to help expel the placenta
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Breastfeeding• Most nutritious option for baby
– Milk changes as baby grows
• Antibodies from mom create immunity for baby• Can protect baby from allergies• Can protect mother from postpartum depression• Breastfeeding may reduce risk of breast cancer• Studies have shown correlation between
breastfeeding and higher intelligence in baby• Bond w/baby is stronger• Helps Mom lose weight & uterus to shrink back
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Full term• Babies are considered full term at 37 weeks• Pregnancy is typically 40 weeks (280 DAYS)
• Pregnancy is broken into trimesters– 1st – 1-3 months– 2nd- 3-6 months– 3rd-6-9 months
• Doctor’s appointments– Start monthly– Around 28 weeks- every 2 weeks– @35 weeks- weekly