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1、循环系统由哪几部分组成? 循环系统包括血液循环系统和淋巴系统。血液循环系统又叫心、血管系统,即由心脏和血管组成。血管分成动脉、静脉和毛细血管;而淋巴系统包括淋巴管和淋巴器官。淋巴器官有淋巴结、胸腺、脾、扁桃
1, the circulatory system consists of several parts? Circulatory system, including the blood circulation and lymphatic system. Blood circulation system is also called the heart, the vascular system, that is composed of the heart and blood vessels. Blood vessels are divided into arteries, veins and capillaries; while the lymphatic system includes lymphatic vessels and lymphoid organs. Lymphatic organs lymph nodes, thymus, spleen, almond