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azIhp{rH w 醫學免疫學問答題部分
1. 簡述T及B淋巴細胞執行特異性免疫的原理。 ;6hoG( 3
+ T細胞和B細胞執行特異性免疫，首先需要被抗原性物質活化，而不同的抗原性物質如病原體成分具有不同的抗原性。一個T或B細胞只表達一種TCR或BCR，只能特異性地識別并結合一種Ag分子，所以，T及B細胞對抗原的識別具有嚴格的特異性，而在T及B細胞的整個群體中，則能識別各種各樣的抗原分子。由于T及B細胞識別抗原的特異性，決定其執行的免疫應答的特異性。 W* S4gPGM 1. 淋巴細胞再循環的方式及作用。 g`'!Vgd?M[ 全身的淋巴細胞與淋巴結內的淋巴細胞不斷進行動態更換。淋巴細胞經淋巴循環及血液循環，運行并分布于全身各處淋巴器官及淋巴組織中，經淋巴循環，經胸導管進入上腔靜脈，再進入血液循環。血液循環中的淋巴細胞及各類免疫細胞在毛細血管后微靜脈處穿過高壁內皮細胞進入淋巴循環。從而達到淋巴循環和血液循環的互相溝通。 h@O\j& # 淋巴細胞的再循環，使淋巴細胞能在體內各淋巴組織及器官處合理分布，能動員淋巴細胞至病原體侵入處，并將抗原活化的淋巴細胞引流入局部淋巴組織及器官，各類免疫細胞在此協同作用，發揮免疫效應。 亚洲国产精品va在线观看麻豆
