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人体血液红细胞中的血红蛋白具有携带氧气的能力。血液经过肺泡时,红细胞中的血红蛋白与氧结合为氧合血红蛋白,呈红色;当血液流经全身时,氧合血红蛋白释放出氧供组织利用,并转变为还原血红蛋白,呈紫色。当还原血红蛋白的量超过50克/升时,皮肤就会出现青紫。如果贫血,当血红蛋白在50克/升以下时,可由各种原因引起青紫,但皮肤不显紫绀。紫绀在皮肤较薄、色素较少的部位如唇、舌、口唇黏膜、耳垂、鼻尖、面颊、指(趾)末端等毛细血管丰富的部位较为明显。出现紫绀,要区别是突然出现,还是持续存在的。突然出现的紫绀多数是
Hemoglobin in human blood red blood cells has the ability to carry oxygen. When blood passes through the alveoli, hemoglobin in red blood cells combines with oxygen to form oxy-hemoglobin, which is red. When blood flows through the body, oxygenated hemoglobin releases oxygen for tissue utilization and turns into reduced hemoglobin, which is purple. When the amount of hemoglobin is reduced to more than 50g / L, the skin will appear bruising. If anemia, hemoglobin at 50 g / L or less, can cause bruising for a variety of reasons, but the skin is not cyanosis. Cyanosis in the skin thinner, less pigmented parts such as lips, lips, lips mucosa, earlobe, nose, cheek, finger (toe) and other capillary-rich parts of the more obvious. Cyanosis occurs, to distinguish the sudden appearance, or persist. The sudden appearance of cyanosis is