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人体的血管和血液循环 人体作为一个整体,各个系统、器官和组织生理机能的维持需要血液充分而不间断的供应。动脉负责将血液运输到器官和组织;在毛细血管内,血液中的营养物质和氧气供应给组织,组织中的代谢产物也可通过毛细血管运走;然后这些血液通过静脉系统运输回到心脏,心脏再将回流的血液泵向动脉系统,完成一次血液循环。
Blood vessels and blood circulation in the human body As a whole, the maintenance of the physiological functions of various systems, organs and tissues requires a full and uninterrupted supply of blood. The arteries are responsible for transporting the blood to the organs and tissues; in the capillaries, nutrients and oxygen in the blood are supplied to the tissues, and the metabolites in the tissues are also transported through the capillaries; these blood are then transported back to the heart through the venous system, The heart will then return the blood pump to the arterial system to complete a blood circulation.