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盛夏气温高,昼夜温差小,此时心脏主要通过增加心率使血液输出量增多,同时内脏血管收缩、皮肤血管扩张,以促进散热。这使得肾血流量和泌尿量明显减少,而汗腺分泌旺盛,以促进机体散热。这些因素综合作用的结果是,有效循环血容量相对不足,血压略降。但是,大量出汗可导致血液浓缩、血液黏滞度增高。如果不能及时补足水分,会使血黏度进一步增高,形成血栓或栓塞等。这些病症对人体是非常危险的。若再不恰当地减停降
Summer high temperature, temperature difference between day and night, this time the heart by increasing the heart rate to increase blood output, while visceral vasoconstriction, skin vasodilation to promote heat dissipation. This makes renal blood flow and urinary output decreased significantly, while strong secretion of sweat glands to promote body heat. As a result of the combination of these factors, the relative lack of effective circulating blood volume, blood pressure slightly lower. However, excessive sweating can result in blood concentration and increased blood viscosity. If you can not make up the water, will make the blood viscosity further increased, the formation of thrombus or embolism. These conditions are very dangerous to the human body. If you stop and stop improperly