Heart beat in the human embryo starts from
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Between 3 and 4 weeks, the body plan emerges as rapid growth of the relatively flat embryo - particularly that of the central nervous system, causes a dramatic folding of the embryo.4 This folding forms the chest and abdominal cavities and incorporates a portion of the yolk sac which becomes the lining of the digestive and respiratory tracts.5 Thus, development of the digestive system is underway just 4 weeks after fertilization.6
Upper and lower limb buds appear by four weeks.7These buds are the first visible indication of the developing arms and legs. Specialized somites in the embryo’s back begin forming the dermis of the skin and the skeletal muscles, which are used for voluntary movement. These somites will also form the bones of the spinal column, skull, sternum, and ribs.8 Skeletal muscles eventually enable you to move your body.
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Upper and lower limb buds appear by four weeks.7These buds are the first visible indication of the developing arms and legs. Specialized somites in the embryo’s back begin forming the dermis of the skin and the skeletal muscles, which are used for voluntary movement. These somites will also form the bones of the spinal column, skull, sternum, and ribs.8 Skeletal muscles eventually enable you to move your body.
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Hearing the Fetal Heartbeat. Doctors use several different methods to listen to the fetal heartbeat. About 3 weeks, one day after fertilization, when theheart first begins to beat, the sound of the little heart is too soft to hear. ... A doctor's stethoscope is not sensitive enough to hear the embryo's heart beating.
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