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Blood Cells and Bone Marrow |
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Script: By 15 weeks, blood-forming stem cells arrive and multiply in the bone marrow. Most blood cell formation will occur here. | ||
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All ages referenced to fertilization, not last menstrual period.
One month = 4 weeks.
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Blood Cells and Bone Marrow
( 3 months, 3 weeks) |
Quickening
( 4 months) |
Movement
( 4 months) |
Hormonal Stress Response
( 4 months, 1 week) |
Vernix Caseosa
( 4 months, 1 week) |
Bronchial Tree
( 4 months, 2 weeks) |
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