Abstract
first week of embryonic development, and into the third week of gestation, the developing embryo's nutritional needs are supplied by diffusion. After the third week of development, nutritional requirements of the embryo can no longer be met by diffusion alone; the heart and vascular systems develop rapidly. This developmental phase extends from the third to the eighth week of gestation. Fetal lung tissue does not develop sufficiently to support extrauterine life until the twenty-sixth to twenty-eighth week of gestation. The fetal heart and vascular systems must therefore be structured
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