[Visitor (111.8.*.*)]answers [Chinese ] | Time :2020-04-19 | Blood is introduced into capillaries by arteries at all levels. Therefore, the artery is the duct between the ventricle and the capillary. It is close to the ventricle, with a large diameter and a thick wall. After repeated branching, the diameter of the tube gradually became smaller, and the wall of the tube became thinner. Finally, an anterior capillary artery similar to the capillary structure was formed and connected to the capillary. |
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