تبلیغات
علـــــــــمی و رزمـــــــــــــی - گلبول سفید
دوشنبه 5 اردیبهشت 1390  08:01 ب.ظ
توسط: کیوان

گلبول سفید

از ویکی‌پدیا، دانشنامهٔ آزاد
(تغییر مسیر از گلبول سفید)
پرش به: ناوبری, جستجو

گویچه‌های سفید (لوکوسیت‌ها) یا گلبول‌های سفید از یاخته‌های خون هستند. گویچه‌های سفید بخشی از دستگاه ایمنی بدن هستند و بدن را از بیماری‌های عفونی محافظت می‌کنند. لوکوسیت‌ها بر اساس حضور یا عدم حضور گرانول‌های اختصاصی در سیتوپلاسم خود به دو دسته گرانولوسیت‌ها (دانه‌دارها) و آگرانولوسیت‌ها (بدون دانه‌ها) تقسیم می‌شوند. لوکوسیت‌ها بر خلاف اریتروسیت‌ها هسته‌دار و متحرک هستند. گرانولوسیت‌ها بر اساس رنگ‌پذیری گرانول‌های اختصاصی به سه دسته نوتروفیل‌ها، اائوزینوفیل‌ها و بازوفیل‌ها تقسیم می‌گردند. نوتروفیل ها(neutrophils) که 60% گلبول‌های سفید خون را تشکیل می‌دهند و با خوردن میکروب‌ها آن‌ها را از بین می‌برند.به این عمل نوتروفیل‌ها فاگوستوزگفته می‌شود. ائوزینوفیل ها(eosinophils)حدود 5% از گلبول سفید خون را تشکیل می‌دهندوسه کار مهم را انجام می‌دهند . اول اینکه بامیکروبها می‌جنگند وآنها را از بین می‌برند. دوم تولید ماده ی شیمیایی هیستامینرا کنترل می‌کنندوسوم اینکه سلولهای پیروفرسوده راازبین می‌برند. بازوفیل ها(bosophils)که حدود1% از گلبول سفید خون را تشکیل می‌دهند .


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