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人体的禁区人的心臟分为右心房、右心室、左心房、左心室四个腔(如图1)。从全身回来的靜脉血(顏色暗紅,含有較多的二氧化碳),經上、下腔靜脉流入右心房,再来到右心室,接着由肺动脉流出,进入肺臟。由于肺的呼吸活动,吸收氧而排出二氧化碳,使靜脉血变成动脉血(顏色鮮紅,含有較多的氧气),再經肺靜脉返回左心房,流到左心室。这时,由于心臟收縮,动脉血就被压出,从主动脉流到全身。由于心臟的活动,血液才得以不断循环,把氧气和营养物质輸送給全身的細胞,又从全身带出二氧
The human heart’s heart is divided into a right atrium, a right ventricle, a left atrium, and a left ventricle (see Figure 1). The venous blood (color red, containing more carbon dioxide) that comes back from the whole body flows into the right atrium through the superior and inferior vena cava, then to the right ventricle, and then flows out of the pulmonary artery into the lungs. Because of the respiratory activity of the lungs, oxygen is absorbed and carbon dioxide is emitted, so that the venous blood becomes arterial blood (red in color, contains more oxygen), and then returns to the left atrium via the pulmonary veins and flows to the left ventricle. At this time, arterial blood is compressed due to the contraction of the heart and flows from the aorta to the entire body. Because of the activity of the heart, the blood can be continuously circulated, and oxygen and nutrients are delivered to the cells of the body, and dioxins are brought out of the body.