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學習快評丨qibao666888　　第??(di)二??(er)道??(dao)防??(fang)御??(yu)是?(shi)“清??(qing)道??(dao)夫??(fu)軍??(jun)團??(tuan)”??，負??(fu)責??(ze)吞??(tun)噬?(shi)與??(yu)清??(qing)掃??(sao)??。??中??(zhong)性??(xing)粒??(li)細??(xi)胞??(bao)24小??(xiao)時?(shi)在??(zai)血??(xue)液??(ye)中??(zhong)“巡??(xun)邏??(luo)”??，一??(yi)旦??(dan)發(fā)??(fa)現??(xian)病??(bing)原??(yuan)體?(ti)??，立??(li)刻??(ke)沖??(chong)鋒??(feng)吞??(tun)噬??(shi)??。巨??(ju)噬?(shi)細??(xi)胞??(bao)如??(ru)同??(tong)“清??(qing)障??(zhang)車??(che)”??，負??(fu)責??(ze)吞??(tun)噬??(shi)病??(bing)原??(yuan)體??(ti)并??(bing)發(fā)??(fa)出??(chu)警??(jing)報??(bao)信??(xin)號??(hao)??，召??(zhao)集??(ji)其??(qi)他??(ta)免??(mian)疫?(yi)細??(xi)胞??(bao)參??(can)戰(zhàn)??(zhan)???！　??(er)童??(tong)至??(zhi)青??(qing)少??(shao)年??(nian)期??(qi)(4～18歲??(sui))??，隨??(sui)著??(zhe)免??(mian)疫??(yi)系??(xi)統(tǒng)??(tong)逐??(zhu)漸??(jian)成??(cheng)熟??(shu)??，適??(shi)應??(ying)性??(xing)免??(mian)疫??(yi)(T細?(xi)胞??(bao)、B細??(xi)胞??(bao))開??(kai)始??(shi)發(fā)??(fa)揮??(hui)主??(zhu)力??(li)作??(zuo)用??(yong)??，能??(neng)針??(zhen)對??(dui)病??(bing)原??(yuan)體??(ti)產??(chan)生??(sheng)特??(te)異??(yi)性??(xing)抗??(kang)體??(ti)??。??但?(dan)免??(mian)疫??(yi)系??(xi)統(tǒng)??(tong)也??(ye)可??(ke)能?(neng)因?(yin)“經??(jing)驗??(yan)不??(bu)足??(zu)”而??(er)反??(fan)應??(ying)過??(guo)度??(du)??，如??(ru)對?(dui)花??(hua)粉??(fen)、食??(shi)物??(wu)等??(deng)無??(wu)害??(hai)物??(wu)質??(zhi)過??(guo)度??(du)反??(fan)應??(ying)??，引??(yin)發(fā)??(fa)哮??(xiao)喘??(chuan)、濕??(shi)疹??(zhen)；如??(ru)接??(jie)觸??(chu)外?(wai)界??(jie)增??(zeng)多??(duo)??，易??(yi)感?(gan)染??(ran)手??(shou)足??(zu)口?(kou)病??(bing)、水??(shui)痘??(dou)等??(deng)傳??(chuan)染??(ran)病??(bing)??。。