| 释义 |
血循环xuèxúnhuán血液从心脏流出,经动脉、毛细管,把氧、养料、激素等输送给全身各部组织,并把组织中的二氧化碳等废物经静脉带回心脏,再经肺动脉带入肺内,进行气体交换后,经肺静脉流回心脏,如此循环不已,叫做血循环。{blood circulation; blood flows out of the heart into arteries and capillaries, transporting oxygen, nutrients and hormones to all body tissues, and bringing back waste such as carbon dioxide to the heart via the veins, and continuing forward via the pulmonary artery to the lungs where air exchange is conducted, and finally back to the heart via the pulmonary vein. Blood circulates continuously in the body.} |