Quicktime Historic Animation - Heart 03

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• Heart Historic Movie 3

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Four separate shifts of cardiac position Week 4 Shift 1 - Head fold growth rotates heart and cavity 180 degrees Shift 2 - Curvature of the body, cephalic growth Week 5 Shift 3 and 4 - Growth of the liver Week 4 - First aortic arches declining, Third arches well developed Myogenic contractions sufficient to circulate blood Atrium migrates to higher location Week 5 - Ventricles do not contract simultaneously Week 6 - Separation of outflow has begun Next: Part 4