The arterial system develops between which weeks of human development?

The arterial system develops primarily between the fourth and eighth weeks of human embryonic development. This period is crucial as the early cardiovascular system begins to form, allowing for the establishment of blood flow to support the developing embryo.

During this time, the heart starts to beat and the major arteries and veins of the embryo begin to form from the mesodermal layer, particularly through processes like vasculogenesis and angiogenesis. These processes involve the differentiation of mesodermal cells into vascular endothelial cells, which then form networks of blood vessels.

The development of the arterial system during these weeks is also critical for the establishment of the embryonic circulatory system, which is necessary for nutrient and gas exchange. This understanding is fundamental for comprehending the broader aspects of embryonic development and the implications of any disruptions that could occur during this critical timeframe.

The other time frames mentioned do not encapsulate the complete and significant steps in arterial development, making the identified period from week four to week eight the correct and most relevant choice.