瘀伤愈合所需的时间和经历的颜色变化遵循可预测的模式。它是如此可预测,医生和法医科学家可以使用瘀伤颜色来估计受伤发生的时间。在受伤的瞬间,新鲜血液溢出瘀伤,对伤口的炎症反应使该区域变为鲜红色,带有新鲜的含氧血液。如果瘀伤发生在皮肤深处,可能看不到红色或粉红色,但您可能会感到肿胀疼痛。瘀伤中的血液不会循环,因此会脱氧并变暗。虽然血液实际上不是蓝色,但是瘀伤可能看起来是蓝色的,因为它是通过皮肤和其他组织观察到的。在第一天左右后,死血细胞中的血红蛋白释放出铁。瘀伤从蓝色变为紫色或黑色。血红蛋白被分解为绿色色素胆绿素。反过来,胆绿素转化为黄色色素,胆红素,胆红素溶解,返回血流,并被肝脏和肾脏过滤。随着胆红素被吸收,瘀伤逐渐消失,直至消失。随着瘀伤愈合,它往往变得多彩。它甚至可能在重力作用下扩散,特别是向下扩散。在瘀伤的边缘愈合最快,慢慢向内部工作。瘀伤颜色的强度和色调取决于多种因素,包括挫伤的严重程度,其位置和肤色。面部或手臂上的瘀伤通常比腿上的瘀伤愈合得更快。

澳洲查尔斯达尔文大学生物学Essay代写:什么是瘀伤? 皮肤下的科学

The time it takes for a bruise to heal and the color changes it undergoes follow a predictable pattern. It’s so predictable, doctors and forensic scientists can use bruise color to estimate when the injury occurred. At the instant of the injury, the fresh blood spilled into a bruise and the inflammation response to the injury turns the area bright red with fresh oxygenated blood. If the bruise occurs deep beneath the skin, the red or pink coloring may not be visible, but you’ll likely feel pain from swelling. The blood in a bruise isn’t in circulation, so it becomes deoxygenated and darkens. While the blood is not actually blue, the bruise may appear blue because it’s viewed through the skin and other tissues. After the first day or so, the hemoglobin from dead blood cells releases its iron. The bruise darkens from blue to purple or black. Hemoglobin is broken down into biliverdin, a green pigment. Biliverdin, in turn, is converted into the yellow pigment, bilirubin, Bilirubin dissolves, returns to the blood stream, and is filtered by the liver and kidneys. As bilirubin is absorbed, a bruise fades away until it’s gone. As a bruise heals, it often becomes multicolored. It may even spread, especially downward under the force of gravity. Healing is fastest at the edges of a bruise, slowly working toward the interior. The intensity and hue of bruise colors depends on multiple factors, including the severity of the contusion, its location, and skin color. Bruises on the face or arms typically heal more quickly than bruises on the legs.

发表评论

电子邮件地址不会被公开。 必填项已用*标注