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为了维持生命活动,呼吸一刻不能停止,血液循环更是须臾不可停顿。呼吸在于吐故纳新,而吐故纳新的得以实现,有赖于血液的循环、心脏的搏动。心脏停止搏动对于生命的威胁远远超过呼吸暂停的后果。 维持生命活动的血液 血液约占人体重的7.5％,总容积约有4～6升。它包括细胞成分(血细胞)和液体成分(血浆)。血细胞包括红细胞、白细胞和血小板,血液除去血细胞就是血浆。 血液主要有两种功能。一种是
In order to maintain life activities, breathing can not stop a moment, the blood circulation is indispensable. Breathing lies in the new entrants, and the new enticements to be realized, depends on the blood circulation, the heart beat. The heart beats the threat to life far beyond the consequences of apnea. Maintaining life activities of blood and blood about 7.5% of body weight, the total volume of about 4 ~ 6 liters. It includes cellular components (blood cells) and fluid components (plasma). Blood cells, including red blood cells, white blood cells and platelets, blood to remove blood cells is plasma. Blood has two main functions. One is