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Everyone knows where babies come from, but few people appreciate the extraordinary and in some cases completely weird processes that have to work right in order for a new life to form.Dr. Allen Wilcox from the NIEHS discusses the key steps of human conception and early pregnancy including the window of days in which a woman can conceive, some of the factors that affect a couple's chances of conceiving, and the new options for infertile couples created by modern technology.
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The Mysteries of Human Fertility: On Sex, Fertile Days, and Why the Rabbit Dies
Allen Wilcox MD, PhDNational Institute of Environmental Health Sciences
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What are an average couple’s chances of conceiving in one
menstrual cycle if they stop using any contraception?
What are an average couple’s chances of conceiving in one
menstrual cycle if they stop using any contraception?
25%
What are an average couple’s chances of conceiving in one
menstrual cycle if they stop using any contraception?
25%
In 3 months 50%In 6 months 66%In one year 90%
Female reproductive tract
Ovary
SPERM
How many days in each cycle is a woman fertile?
• Six days:– Five days before ovulation
– The day of ovulation
How many days is a woman fertile?
The perilous journey of the fertilized egg
Fertilized human eggs
DAY 2 DAY 3
A woman needed a kidney transplant. Her adult children were tested as possible donors.
After testing, the doctors told the woman that her children were not really hers.
A woman needed a kidney transplant. Her adult children were tested as possible donors.
After testing, the doctors told the woman that her children were not really hers.
A woman needed a kidney transplant. Her adult children were tested as possible donors.
After testing, the doctors told the woman that her children were not really hers.
Human chimerism.
“ICSI” – intracellular sperm injection
What are the chances that an implanted blastocyst will die in utero?
What are the chances that an implanted blastocyst will die in utero? 33%
Q: What can biology tell us about when a human life begins?
Q&A
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