Human Embryology 101
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Fetal
heart begins to form 18 days after conception
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Measurable
heart beat 21-24 days after conception
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Fetal
brain begins to form on day 25
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Brain
waves produced by 6 weeks
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| HomeSlide 11 of 49
Milestones of human
development begin early. For example, the human heart beings to form 18
days after conception and exhibits a measurable heart beat at 21-24 days.1
The brain begins to form at this time2 and
produces measurable brain waves at day 40.3
References 
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Heart Development at the Loyola University Chicago web
site
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"Life Before Birth" Life
Magazine Educational Reprint 27, April 30, 1965, page 6.
and Week 4 at the Loyola University Chicago web
site
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Brain development slideshow
at Temple University
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http://www.godandscience.org/abortion/sld011.html