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	<title>十万个为什么 &#187; 人体的奥秘</title>
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	<description>打造在线青少年百科全书！</description>
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		<item>
		<title>“肝火”就是肝上火吗？</title>
		<link>http://www.10why.net/20120207/gan-huo/</link>
		<comments>http://www.10why.net/20120207/gan-huo/#comments</comments>
		<pubDate>Tue, 07 Feb 2012 10:02:28 +0000</pubDate>
		<dc:creator>jackly</dc:creator>
				<category><![CDATA[人体的奥秘]]></category>
		<category><![CDATA[肝]]></category>
		<category><![CDATA[肝火]]></category>

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		<description><![CDATA[人体的整个右上腹部都被肝脏占据着。成人肝的体积约为25×15×6立方厘米，重约1200～1500克， 是人体最大的实质性脏器。有人认为肝火就是肝上火了，这是没有科学依据的。肝脏的生理功能十分复杂，犹如一座巨大的“化工厂”。肝脏是胆汁制造厂，每日不断分泌胆汁，帮助胃肠道消化脂肪，吸收脂溶性的维生素A、维生素D、维生素E、维生素K。肝脏能合成蛋白质，并有脱氨与转氨作用， 把氨合成为尿素经肾脏从尿中排出。肝脏还能把碳水化合物、脂肪和蛋白质转变成糖元储存于肝内，以随时供给身体使用。肝脏还参与内分泌的调节。肝脏能制造纤维蛋白原、凝血酶原及各种凝血因子，帮助止血。肝脏还是个“解毒厂”。代谢中产生的毒物或外来毒物，经过肝脏时都被分化瓦解。肝脏又是个“过滤厂”。因为肝脏有吞噬和免疫的功能，能清除血液中的细菌、色素和其他碎屑。肝脏的再生能力很强。在动物实验中，正常的肝脏被切除70%～80%，这个“化工厂”仍继续开工不倒闭，而且过了6周又会再生到原来大小。但是，人的肝脏约需一年时间才能恢复到原来的肝重量。 相关文章没找到相关文章最新评论<table class="wumii-related-items" cellspacing="0" cellpadding="3" border="0"  style="clear: both;">
    
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			<content:encoded><![CDATA[<p><span class='bm_keywordlink_affiliate'><a href="	 http://www.10why.net/tag/人体" target="_blank">人体</a></span>的整个右上腹部都被肝脏占据着。成人肝的体积约为25×15×6立方厘米，重约1200～1500克， 是人体最大的实质性脏器。有人认为肝火就是肝上火了，这是没有科学依据的。肝脏的生理功能十分复杂，犹如一座巨大的“化工厂”。肝脏是胆汁制造厂，每日不断分泌胆汁，帮助胃肠道消化脂肪，吸收脂溶性的维生素A、维生素D、维生素E、维生素K。肝脏能合成蛋白质，并有脱氨与转氨作用， 把氨合成为尿素经肾脏从尿中排出。肝脏还能把碳水化合物、脂肪和蛋白质转变成糖元储存于肝内，以随时供给身体使用。肝脏还参与内分泌的调节。肝脏能制造纤维蛋白原、凝血酶原及各种凝血因子，帮助止血。肝脏还是个“解毒厂”。代谢中产生的毒物或外来毒物，经过肝脏时都被分化瓦解。肝脏又是个“过滤厂”。因为肝脏有吞噬和免疫的功能，能清除血液中的细菌、色素和其他碎屑。肝脏的再生能力很强。在动物实验中，正常的肝脏被切除70%～80%，这个“化工厂”仍继续开工不倒闭，而且过了6周又会再生到原来大小。但是，人的肝脏约需一年时间才能恢复到原来的肝<span class='bm_keywordlink_affiliate'><a href="http://www.10why.net/tag/重量" target="_blank">重量</a></span>。</p>
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</table><h3>相关文章</h3><ul><li>没找到相关文章</li></ul><h3>最新评论</h3><ul></ul>]]></content:encoded>
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		</item>
		<item>
		<title>少女为什么会来月经?</title>
		<link>http://www.10why.net/20120202/yue-jing/</link>
		<comments>http://www.10why.net/20120202/yue-jing/#comments</comments>
		<pubDate>Thu, 02 Feb 2012 06:37:55 +0000</pubDate>
		<dc:creator>jackly</dc:creator>
				<category><![CDATA[人体的奥秘]]></category>
		<category><![CDATA[推荐]]></category>
		<category><![CDATA[少女]]></category>
		<category><![CDATA[月经]]></category>

		<guid isPermaLink="false">http://www.10why.net/?p=3265</guid>
		<description><![CDATA[女孩子到了青春发育期后，每28～30天中，就有3～5天阴道流血，血量约50毫升，月月如此，很有规律，这就是月经。简单讲，月经就是子宫内膜在性激素操纵下所进行的一场“耕耘之战”。在每月卵巢生产出卵子的前些日子，脑垂体会分泌大量卵泡刺激素，卵巢会生产更多雌激素，促使子宫内膜增厚、血管增多和腺体分泌增加，宛如土壤松土与施肥。若有受精卵光临，并在这块肥沃的“土壤”里生长，这就是怀孕。于是，子宫内膜不需要再“耕耘”，月经也就停止。相反，如果没有怀孕，子宫内膜便发生细胞脱落、血管萎瘪，变成经血流出。但事隔不久，子宫又得为下一月的卵子诞生作准备。 相关文章没找到相关文章最新评论<table class="wumii-related-items" cellspacing="0" cellpadding="3" border="0"  style="clear: both;">
    
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			<content:encoded><![CDATA[<p>女孩子到了青春发育期后，每28～30天中，就有3～5天阴道流血，血量约50毫升，月月如此，很有规律，这就是月经。简单讲，月经就是子宫内膜在性激素操纵下所进行的一场“耕耘之战”。在每月卵巢生产出卵子的前些日子，脑垂体会分泌大量卵泡刺激素，卵巢会生产更多雌激素，促使子宫内膜增厚、血管增多和腺体分泌增加，宛如土壤松土与施肥。若有受精卵光临，并在这块肥沃的“土壤”里生长，这就是怀孕。于是，子宫内膜不需要再“耕耘”，月经也就停止。相反，如果没有怀孕，子宫内膜便发生细胞脱落、血管萎瘪，变成经血流出。但事隔不久，子宫又得为下一月的卵子诞生作准备。</p>
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</table><h3>相关文章</h3><ul><li>没找到相关文章</li></ul><h3>最新评论</h3><ul></ul>]]></content:encoded>
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		<item>
		<title>为什么人吸进氧气，呼出时变成了二氧化碳?</title>
		<link>http://www.10why.net/20120111/yang-qi/</link>
		<comments>http://www.10why.net/20120111/yang-qi/#comments</comments>
		<pubDate>Wed, 11 Jan 2012 02:55:09 +0000</pubDate>
		<dc:creator>jackly</dc:creator>
				<category><![CDATA[人体的奥秘]]></category>
		<category><![CDATA[精华]]></category>
		<category><![CDATA[二氧化碳]]></category>
		<category><![CDATA[呼吸]]></category>
		<category><![CDATA[氧气]]></category>

		<guid isPermaLink="false">http://www.10why.net/?p=3270</guid>
		<description><![CDATA[人体中有一个专门负责气体交换的器官，它就是肺脏。当氧气被鼻孔吸入，便进入到气管。气管笔直向下，然后分为左右两根支气管，分别埋藏在左右两肺之中。支气管会不断地细分，产生无数极细微的分支，每一根细支气管末端都连接着几个肺泡。肺脏就是由重重叠叠的细支气管和肺泡组成的。肺泡表面布满了毛细血管。吸进的新鲜氧气就在这儿扩散到毛细血管中，随着血液流动到达人体的四面八方。与此同时，人体中产生的二氧化碳废气也来到这儿的毛细血管中，通过气体交换进入到肺泡内部，再从支气管汇集到气管处，最后随呼气排出体外。吸入的新鲜氧气就是通过这样一连串过程，才变成二氧化碳废气的。 相关文章没找到相关文章最新评论勃夫~空间侦探 : 氧气是一种可以分解能量的结构分子团，它的不稳定性反映在人体血液中许多分子团的空间特性，这些特性反映出... 勃夫~侦探空间使者 : 释放能量是分解型化学反应，而吸收能量是集合型高分子化学反应，这是比较复杂的空间能量结构特性。所以由氧...<table class="wumii-related-items" cellspacing="0" cellpadding="3" border="0"  style="clear: both;">
    
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			<content:encoded><![CDATA[<p><span class='bm_keywordlink_affiliate'><a href="	 http://www.10why.net/tag/人体" target="_blank">人体</a></span>中有一个专门负责气体交换的器官，它就是肺脏。当氧气被鼻孔吸入，便进入到气管。气管笔直向下，然后分为左右两根支气管，分别埋藏在左右两肺之中。支气管会不断地细分，产生无数极细微的分支，每一根细支气管末端都连接着几个肺泡。肺脏就是由重重叠叠的细支气管和肺泡组成的。肺泡表面布满了毛细血管。吸进的<span class='bm_keywordlink_affiliate'><a href="http://www.10why.net/tag/新鲜" target="_blank">新鲜</a></span>氧气就在这儿扩散到毛细血管中，随着血液流动到达人体的四面八方。与此同时，人体中产生的二氧化碳废气也来到这儿的毛细血管中，通过气体交换进入到肺泡内部，再从支气管汇集到气管处，最后随呼气排出体外。吸入的新鲜氧气就是通过这样一连串过程，才变成二氧化碳废气的。</p>
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</table><h3>相关文章</h3><ul><li>没找到相关文章</li></ul><h3>最新评论</h3><ul><li><a class="commentor" href="" >勃夫~空间侦探</a> : <a class="comment_content" href="http://www.10why.net/20120111/yang-qi/#comment-3872" title="View the entire comment by 勃夫~空间侦探" >氧气是一种可以分解能量的结构分子团，它的不稳定性反映在人体血液中许多分子团的空间特性，这些特性反映出...</a></li>
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		</item>
		<item>
		<title>为什么人有脉博？</title>
		<link>http://www.10why.net/20111208/mai-bo/</link>
		<comments>http://www.10why.net/20111208/mai-bo/#comments</comments>
		<pubDate>Thu, 08 Dec 2011 11:44:52 +0000</pubDate>
		<dc:creator>jackly</dc:creator>
				<category><![CDATA[人体的奥秘]]></category>
		<category><![CDATA[心率]]></category>
		<category><![CDATA[脉搏]]></category>

		<guid isPermaLink="false">http://www.10why.net/?p=3170</guid>
		<description><![CDATA[我们经常可以看到，在检查身体时总有一项是检查心率，心率就是每分钟心脏跳动的次数，检查心率时，医务人员把手放在受测者的手腕上。要知道为什么能在腕部摸到脉搏，一定要了解人体的血液循环。你一定知道血液是在血管里流动的，当人正常活动的时候，血液就会不停地在血管里流动运转，而运转的动力就来源于心脏。人体内的血管都是与心脏相通的，在医学上，把容纳从心脏里流出血液的血管称为动脉。流动在动脉血管里的血液充满了氧气和营养物质，大体上它们是红色的。而容纳流向心脏的血液的血管叫静脉，静脉里的血液含二氧化碳和废物，所以颜色发紫。 动脉与静脉由无数的小血管相连，我们称这些小血管为毛细血管。心脏就像一个大水泵，经过它一松一缩的运动，一下一下地把血液送到动脉血管，由大动脉到小动脉，流遍全身，再经过无数的毛细血管，流入静脉又回到心脏。但是血管是软的，像胶皮管一样有弹性，经过它的收缩，血液就被挤出，冲击到动脉，所以动脉也相应地胀一下，之所以能在腕部摸到脉搏是因为在腕部有动脉经过。心脏把一股一股的血不断地向外送，动脉也就一下一下地跳动，人们通过按压腕部的动脉，就可以了解到心脏跳动的。 血压的正常值是多少？ 心脏在收缩时， 会对它自身和动脉血管产生一种压力， 这就是人们常说的血压。当心室收缩时，血压达到最高值——高压，心室舒张时便降到最低值——低压。血压都用两个数字来表示。人体各段血管中的血压是不同的，我们通常所说的血压都在手臂的肱动脉处测量。成年人的正常血压为：低压：8.0～12.0KPa（60～90毫米汞柱)；高压：12.0～18.6KPa(90～140 毫米汞柱)。 相关文章没找到相关文章最新评论<table class="wumii-related-items" cellspacing="0" cellpadding="3" border="0"  style="clear: both;">
    
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			<content:encoded><![CDATA[<p>我们经常可以看到，在检查身体时总有一项是检查心率，心率就是每分钟心脏跳动的次数，检查心率时，医务人员把手放在受测者的手腕上。要知道<span class='bm_keywordlink'><a href="http://www.10why.net" target="_blank">为什么</a></span>能在腕部摸到脉搏，一定要了解<span class='bm_keywordlink_affiliate'><a href="	 http://www.10why.net/tag/人体" target="_blank">人体</a></span>的血液循环。你一定知道血液是在血管里流动的，当人正常活动的时候，血液就会不停地在血管里流动运转，而运转的动力就来源于心脏。人体内的血管都是与心脏相通的，在医学上，把容纳从心脏里流出血液的血管称为动脉。流动在动脉血管里的血液充满了氧气和<span class='bm_keywordlink_affiliate'><a href="http://www.10why.net/tag/营养" target="_blank">营养</a></span>物质，大体上它们是红色的。而容纳流向心脏的血液的血管叫静脉，静脉里的血液含二氧化碳和废物，所以<span class='bm_keywordlink_affiliate'><a href="http://www.10why.net/tag/颜色" target="_blank">颜色</a></span>发紫。 动脉与静脉由无数的小血管相连，我们称这些小血管为毛细血管。心脏就像一个大水泵，经过它一松一缩的运动，一下一下地把血液送到动脉血管，由大动脉到小动脉，流遍全身，再经过无数的毛细血管，流入静脉又回到心脏。但是血管是软的，像胶皮管一样有弹性，经过它的收缩，血液就被挤出，冲击到动脉，所以动脉也相应地胀一下，之所以能在腕部摸到脉搏是因为在腕部有动脉经过。心脏把一股一股的血不断地向外送，动脉也就一下一下地跳动，人们通过按压腕部的动脉，就可以了解到心脏跳动的。</p>
<blockquote><p>血压的正常值是多少？<br />
心脏在收缩时， 会对它自身和动脉血管产生一种压力， 这就是人们常说的血压。当心室收缩时，血压达到最高值——高压，心室舒张时便降到最低值——低压。血压都用两个数字来表示。人体各段血管中的血压是不同的，我们通常所说的血压都在手臂的肱动脉处测量。成年人的正常血压为：低压：8.0～12.0KPa（60～90毫米汞柱)；高压：12.0～18.6KPa(90～140 毫米汞柱)。</p></blockquote>
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</table><h3>相关文章</h3><ul><li>没找到相关文章</li></ul><h3>最新评论</h3><ul></ul>]]></content:encoded>
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		<item>
		<title>为什么说白血球是人体“卫士”？</title>
		<link>http://www.10why.net/20111205/bai-xue-qiu/</link>
		<comments>http://www.10why.net/20111205/bai-xue-qiu/#comments</comments>
		<pubDate>Mon, 05 Dec 2011 09:07:52 +0000</pubDate>
		<dc:creator>jackly</dc:creator>
				<category><![CDATA[人体的奥秘]]></category>
		<category><![CDATA[卫士]]></category>
		<category><![CDATA[白血球]]></category>

		<guid isPermaLink="false">http://www.10why.net/?p=2479</guid>
		<description><![CDATA[通过血管的血液白细胞的主要功能是通过吞噬、消化及免疫反应，抵御外来微生物对机体的损害，实现对机体的保护。中性粒细胞具有活跃的变形能力、敏锐的趋化性和很强的吞噬及消化致病微生物的能力，是吞噬微生物病原体的主要细胞。单核巨噬细胞的主要作用是吞噬消灭病毒、疟原虫和结核分支杆菌等致病物；识别和杀伤肿瘤细胞；识别和消除衰老受损的红细胞、血小板；吞噬逸出的血红蛋白，并参与体内铁和胆色素的代谢。 此外，巨噬细胞还能产生细胞团刺激因子，调节粒细胞等血细胞的造血过程。淋巴细胞是人体免疫功能的主力军，又可分为T淋巴细胞和B淋巴细胞两种。T淋巴细胞主要执行细胞免疫功能。异物抗原经巨噬细胞吞噬处理后，将决定异物特异性的抗原物质传送到T淋巴细胞，激活T淋巴细胞。T淋巴细胞能破坏具有这种特异抗原的异物。B淋巴细胞主要执行体液免疫球蛋白功能，能识别、凝集、溶解异物或中和毒素。可见，白细胞是名副其实的人体“卫士”。 相关文章没找到相关文章最新评论<table class="wumii-related-items" cellspacing="0" cellpadding="3" border="0"  style="clear: both;">
    
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			<content:encoded><![CDATA[<p>通过血管的血液白细胞的主要功能是通过吞噬、消化及免疫反应，抵御外来微生物对机体的损害，实现对机体的保护。中性粒细胞具有活跃的变形能力、敏锐的趋化性和很强的吞噬及消化致病微生物的能力，是吞噬微生物病原体的主要细胞。单核巨噬细胞的主要作用是吞噬消灭<span class='bm_keywordlink_affiliate'><a href="http://www.10why.net/tag/病毒" target="_blank">病毒</a></span>、疟原虫和结核分支杆菌等致病物；识别和杀伤肿瘤细胞；识别和消除<span class='bm_keywordlink_affiliate'><a href="http://www.10why.net/tag/衰老" target="_blank">衰老</a></span>受损的红细胞、血小板；吞噬逸出的血红蛋白，并参与体内铁和胆色素的代谢。</p>
<p>此外，巨噬细胞还能产生细胞团刺激因子，调节粒细胞等血细胞的造血过程。淋巴细胞是<span class='bm_keywordlink_affiliate'><a href="	 http://www.10why.net/tag/人体" target="_blank">人体</a></span>免疫功能的主力军，又可分为T淋巴细胞和B淋巴细胞两种。T淋巴细胞主要执行细胞免疫功能。异物抗原经巨噬细胞吞噬处理后，将决定异物特异性的抗原物质传送到T淋巴细胞，激活T淋巴细胞。T淋巴细胞能破坏具有这种特异抗原的异物。B淋巴细胞主要执行体液免疫球蛋白功能，能识别、凝集、溶解异物或中和毒素。可见，白细胞是名副其实的人体“卫士”。</p>
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</table><h3>相关文章</h3><ul><li>没找到相关文章</li></ul><h3>最新评论</h3><ul></ul>]]></content:encoded>
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		<item>
		<title>“脾气”和脾有关吗？</title>
		<link>http://www.10why.net/20111129/pi-qi/</link>
		<comments>http://www.10why.net/20111129/pi-qi/#comments</comments>
		<pubDate>Tue, 29 Nov 2011 08:35:06 +0000</pubDate>
		<dc:creator>jackly</dc:creator>
				<category><![CDATA[人体的奥秘]]></category>
		<category><![CDATA[脾]]></category>
		<category><![CDATA[脾气]]></category>

		<guid isPermaLink="false">http://www.10why.net/?p=2498</guid>
		<description><![CDATA[脾脏位于腹腔的左侧，是一个紫红色的器官，形似一个松散的拳头。脾脏是人体中最大的“贮血库”，可以贮存人体总血量20％的血液。当人体血循环需要血液时，脾脏等会连续不断地释放血液进入血管，参与血循环。脾脏曾被称做“所有器官中最被忽视和误解的”。以前，人们认脾气和脾脏有关，其实这是没有科学依据的，实际上脾脏是免疫系统的一部分，它可以滤去感染人体血液的外部有机物；去除衰老和损伤的血小板和红细胞；储存多余的血液，在需要时释放；形成一些类型的白细胞。如果脾脏受伤或得病了，可以通过一种叫“脾切除术”的医疗手段被切除，切脾后机体免疫力会暂时下降，而对感染的易感性就会增加，但过一段时间，人体的其他器官，比如肝脏，将逐渐“接管”脾脏的职责。 脾脏并不是没有用的器官，虽然切除了它人还能存活，但在短时间内，人体的免疫力会下降。 相关文章没找到相关文章最新评论<table class="wumii-related-items" cellspacing="0" cellpadding="3" border="0"  style="clear: both;">
    
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			<content:encoded><![CDATA[<p>脾脏位于腹腔的左侧，是一个紫红色的器官，形似一个松散的拳头。脾脏是<span class='bm_keywordlink_affiliate'><a href="	 http://www.10why.net/tag/人体" target="_blank">人体</a></span>中最大的“贮血库”，可以贮存人体总血量20％的血液。当人体血循环需要血液时，脾脏等会连续不断地释放血液进入血管，参与血循环。脾脏曾被称做“所有器官中最被忽视和误解的”。以前，人们认脾气和脾脏有关，其实这是没有科学依据的，实际上脾脏是免疫系统的一部分，它可以滤去感染人体血液的外部有机物；去除<span class='bm_keywordlink_affiliate'><a href="http://www.10why.net/tag/衰老" target="_blank">衰老</a></span>和损伤的血小板和红细胞；储存多余的血液，在需要时释放；形成一些类型的白细胞。如果脾脏受伤或得病了，可以通过一种叫“脾切除术”的医疗手段被切除，切脾后机体免疫力会暂时下降，而对感染的易感性就会增加，但过一段时间，人体的其他器官，比如肝脏，将逐渐“接管”脾脏的职责。</p>
<blockquote><p>脾脏并不是没有用的器官，虽然切除了它人还能存活，但在短时间内，人体的免疫力会下降。</p></blockquote>
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</table><h3>相关文章</h3><ul><li>没找到相关文章</li></ul><h3>最新评论</h3><ul></ul>]]></content:encoded>
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		<item>
		<title>为什么红细胞有免疫功能？</title>
		<link>http://www.10why.net/20111129/hong-xi-bao/</link>
		<comments>http://www.10why.net/20111129/hong-xi-bao/#comments</comments>
		<pubDate>Tue, 29 Nov 2011 08:35:02 +0000</pubDate>
		<dc:creator>jackly</dc:creator>
				<category><![CDATA[人体的奥秘]]></category>
		<category><![CDATA[免疫]]></category>
		<category><![CDATA[红细胞]]></category>

		<guid isPermaLink="false">http://www.10why.net/?p=2476</guid>
		<description><![CDATA[人体免疫系统能识别、排除细菌或病毒及自身衰老变性成分等“异己物质”，使人体维持稳定的生理平衡。免疫系统有细胞免疫和体液免疫两类。红细胞的免疫功能，既不同于两者，但又有联系。红细胞是血液中运输氧和二氧化碳的主要工具，这是大多数人都知道的。但红细胞也有免疫功能，恐怕许多人还不了解。归纳起来，其免疫功能有3个特点： （1）红细胞对细菌、病毒等抗原性异物的侵入，可产生与此相应的抗体，并与抗原结合成免疫复合物，再通过血清中的补体与红细胞表面的受体结合，将它带至肝脏等处进行清除。由于红细胞为数众多，而且受体95%处在表面，与免疫复合物相遇的机会比白细胞要大1000倍。 （2）能通过红细胞具有过氧化物酶活性的特点，直接消灭所粘附的抗原性异物。 （3）红细胞的存在，可大大促进吞噬细胞的吞噬作用。红细胞的免疫功能， 还可从某些疾病的发生和发展过程中得到证明，如因遗传因素而引起的红细胞表面受体较少的人，红细胞免疫功能低下，是系统性红斑狼疮、类风湿性关节炎、自身免疫性疾病，以及病毒性肝炎、流行性出血热等传染病和肝癌等恶性肿瘤疾病的发病原因之一。为此，有的医院已将检测红细胞免疫功能作为评估病人免疫力的一项指标。 相关文章没找到相关文章最新评论<table class="wumii-related-items" cellspacing="0" cellpadding="3" border="0"  style="clear: both;">
    
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			<content:encoded><![CDATA[<p><span class='bm_keywordlink_affiliate'><a href="	 http://www.10why.net/tag/人体" target="_blank">人体</a></span>免疫系统能识别、排除细菌或<span class='bm_keywordlink_affiliate'><a href="http://www.10why.net/tag/病毒" target="_blank">病毒</a></span>及自身<span class='bm_keywordlink_affiliate'><a href="http://www.10why.net/tag/衰老" target="_blank">衰老</a></span>变性成分等“异己物质”，使人体维持稳定的生理<span class='bm_keywordlink_affiliate'><a href="http://www.10why.net/tag/平衡" target="_blank">平衡</a></span>。免疫系统有细胞免疫和体液免疫两类。红细胞的免疫功能，既不同于两者，但又有联系。红细胞是血液中运输氧和二氧化碳的主要工具，这是大多数人都知道的。但红细胞也有免疫功能，恐怕许多人还不了解。归纳起来，其免疫功能有3个特点：</p>
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（2）能通过红细胞具有过氧化物酶活性的特点，直接消灭所粘附的抗原性异物。<br />
（3）红细胞的存在，可大大促进吞噬细胞的吞噬作用。红细胞的免疫功能， 还可从某些疾病的发生和发展过程中得到证明，如因遗传因素而引起的红细胞表面受体较少的人，红细胞免疫功能低下，是系统性红斑狼疮、类风湿性关节炎、自身免疫性疾病，以及病毒性肝炎、流行性出血热等传染病和肝癌等恶性肿瘤疾病的发病原因之一。为此，有的医院已将检测红细胞免疫功能作为评估病人免疫力的一项指标。</p>
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		</item>
		<item>
		<title>为什么血型不合就不能进行输血？</title>
		<link>http://www.10why.net/20111129/xie-xing/</link>
		<comments>http://www.10why.net/20111129/xie-xing/#comments</comments>
		<pubDate>Tue, 29 Nov 2011 08:34:54 +0000</pubDate>
		<dc:creator>jackly</dc:creator>
				<category><![CDATA[人体的奥秘]]></category>
		<category><![CDATA[血型]]></category>
		<category><![CDATA[输血]]></category>

		<guid isPermaLink="false">http://www.10why.net/?p=2473</guid>
		<description><![CDATA[血浆里含有能起粘合作用的凝集素，红细胞里则含有能被粘合的凝集原。凝集原有两种，A和B；凝集素也有两种，α和β。A和α、B和β是两对冤家，碰到一起就要“打架”，扭在一起产生凝集反应。人的血型分4种。A型：红细胞里含有凝集原A，血浆里含有凝集素β；B型：红细胞里含有凝集原B，血浆里含有凝集素α；AB型：红细胞内含有凝集原A和B，血浆里不含任何凝集素；O型：红细胞里不含任何凝集原，血浆里含有凝集素α和β。输血时如果血型不合，输入血液中的凝集原A与病人血浆中的凝集素α相遇，或输入血液中的凝集原B与病人血浆中的凝集素β相遇，就会发生凝集反应，导致红细胞皱缩变形，引起生命危险。所以，血型不合者千万不能输血。 人体内有多少血液？ 一个成年男性的身体内大约有6升血液在循环流动；一个成年女性约有5升。 相关文章没找到相关文章最新评论<table class="wumii-related-items" cellspacing="0" cellpadding="3" border="0"  style="clear: both;">
    
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			<content:encoded><![CDATA[<p>血浆里含有能起粘合作用的凝集素，红细胞里则含有能被粘合的凝集原。凝集原有两种，A和B；凝集素也有两种，α和β。A和α、B和β是两对冤家，碰到一起就要“打架”，扭在一起产生凝集反应。人的血型分4种。A型：红细胞里含有凝集原A，血浆里含有凝集素β；B型：红细胞里含有凝集原B，血浆里含有凝集素α；AB型：红细胞内含有凝集原A和B，血浆里不含任何凝集素；O型：红细胞里不含任何凝集原，血浆里含有凝集素α和β。输血时如果血型不合，输入血液中的凝集原A与病人血浆中的凝集素α相遇，或输入血液中的凝集原B与病人血浆中的凝集素β相遇，就会发生凝集反应，导致红细胞皱缩变形，引起生命危险。所以，血型不合者千万不能输血。</p>
<blockquote><p><span class='bm_keywordlink_affiliate'><a href="	 http://www.10why.net/tag/人体" target="_blank">人体</a></span>内有多少血液？<br />
一个成年男性的身体内大约有6升血液在循环流动；一个成年女性约有5升。</p></blockquote>
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		<title>为什么男子会长胡子?</title>
		<link>http://www.10why.net/20111128/hu-zi/</link>
		<comments>http://www.10why.net/20111128/hu-zi/#comments</comments>
		<pubDate>Mon, 28 Nov 2011 09:55:54 +0000</pubDate>
		<dc:creator>jackly</dc:creator>
				<category><![CDATA[人体的奥秘]]></category>
		<category><![CDATA[男人]]></category>
		<category><![CDATA[胡子]]></category>

		<guid isPermaLink="false">http://www.10why.net/?p=2495</guid>
		<description><![CDATA[为什么男子会长胡子而女子不会呢？这与人体内性激素代谢有密切的关系。一般来说，青春期后的健康男性都会长胡子，最初柔软稀少，以后逐渐变得粗硬稠密。现代医学发现，这时候男子体内分泌出较多的雄性激素使毛发又黑又粗，胡子的产生就是一种典型的表现。 而女子体内此时雌性激素占有绝对优势，雄性激素数量很少，助长毛发的作用远不如男子。相比之下，她们的毛发就比较纤细，颜色也比较淡，所以，女子就不会长出浓密粗硬的黑胡子了。然而，有的女子在青春期也会长“胡子”，为此感到苦恼和难为情。其实这不是胡子，只是口的四周汗毛较重些，不会影响身体健康，通常过了青春期就会自行消失。 男性的变声过程 男孩的声带在13岁左右会发生变化，因为大量的发育在13岁前完成。男性在超过65岁时嗓音还会有一次变化， 声调变高，声音发颤。 相关文章男人与女人的身体有什么差别？(1) 最新评论<table class="wumii-related-items" cellspacing="0" cellpadding="3" border="0"  style="clear: both;">
    
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			<content:encoded><![CDATA[<p><span class='bm_keywordlink'><a href="http://www.10why.net" target="_blank">为什么</a></span>男子会长胡子而女子不会呢？这与<span class='bm_keywordlink_affiliate'><a href="	 http://www.10why.net/tag/人体" target="_blank">人体</a></span>内性激素代谢有密切的关系。一般来说，青春期后的健康男性都会长胡子，最初柔软稀少，以后逐渐变得粗硬稠密。现代医学发现，这时候男子体内分泌出较多的雄性激素使毛发又黑又粗，胡子的产生就是一种典型的表现。 而女子体内此时雌性激素占有绝对优势，雄性激素数量很少，助长毛发的作用远不如男子。相比之下，她们的毛发就比较纤细，<span class='bm_keywordlink_affiliate'><a href="http://www.10why.net/tag/颜色" target="_blank">颜色</a></span>也比较淡，所以，女子就不会长出浓密粗硬的黑胡子了。然而，有的女子在青春期也会长“胡子”，为此感到苦恼和难为情。其实这不是胡子，只是口的四周汗毛较重些，不会影响身体健康，通常过了青春期就会自行消失。</p>
<blockquote><p><strong>男性的变声过程</strong><br />
男孩的声带在13岁左右会发生变化，因为大量的发育在13岁前完成。男性在超过65岁时嗓音还会有一次变化， 声调变高，<span class='bm_keywordlink_affiliate'><a href="http://www.10why.net/tag/声音" target="_blank">声音</a></span>发颤。</p></blockquote>
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		<pubDate>Fri, 25 Nov 2011 06:28:56 +0000</pubDate>
		<dc:creator>jackly</dc:creator>
				<category><![CDATA[人体的奥秘]]></category>
		<category><![CDATA[未分类]]></category>
		<category><![CDATA[女人]]></category>
		<category><![CDATA[差别]]></category>
		<category><![CDATA[男人]]></category>

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		<description><![CDATA[青春发育期以后，男女之间的差别很明显。男人的皮肤比较粗糙，女人的皮肤光滑、细腻。男人的肌肉比女人发达，骨骼比女人坚实。女人的脂肪比较多。男人心脏跳动慢，女人心脏跳动快。男人平均每千克体重、红细胞数量、带有氧气的血液数量比女人多。 男人的肺活量几乎比女人的高出一半。男人右脑半球比较发达，女人左脑半球比较发达。男女之间的最大差别，是有着不同的生殖器官。男子的生殖器包括阴茎、阴囊、睾丸和输精管等，生殖腺——睾丸是在体外的，这是产生精子和男性激素的器官。女子的生殖器包括外阴、阴道、子宫、输卵管和卵巢，子宫埋在小肚子里，是胎儿的“摇篮”，生殖腺——卵巢就在子宫左右两边，它的作用是产生卵子和分泌女性激素。 相关文章为什么男子会长胡子?(0) 最新评论郝博奇 : 这个说不好<table class="wumii-related-items" cellspacing="0" cellpadding="3" border="0"  style="clear: both;">
    
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			<content:encoded><![CDATA[<p><a href="http://www.10why.net/wp-content/uploads/2011/11/nannv.jpg"></a>青春发育期以后，男女之间的差别很明显。男人的皮肤比较粗糙，女人的皮肤光滑、细腻。男人的肌肉比女人发达，骨骼比女人坚实。女人的脂肪比较多。男人心脏跳动慢，女人心脏跳动快。男人平均每千克体重、红细胞数量、带有氧气的血液数量比女人多。 男人的肺活量几乎比女人的高出一半。男人右脑半球比较发达，女人左脑半球比较发达。男女之间的最大差别，是有着不同的生殖器官。男子的生殖器包括阴茎、阴囊、睾丸和输精管等，生殖腺——睾丸是在体外的，这是产生精子和男性激素的器官。女子的生殖器包括外阴、阴道、子宫、输卵管和卵巢，子宫埋在小肚子里，是胎儿的“摇篮”，生殖腺——卵巢就在子宫左右两边，它的作用是产生卵子和分泌女性激素。</p>
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</table><h3>相关文章</h3><ul><li><a href="http://www.10why.net/20111128/hu-zi/" title="为什么男子会长胡子? 2011.11.28">为什么男子会长胡子?</a>(0)</li>
</ul><h3>最新评论</h3><ul><li><a class="commentor" href="http://www.haoboqi.51.com" >郝博奇</a> : <a class="comment_content" href="http://www.10why.net/20111125/nan-nv/#comment-3542" title="View the entire comment by 郝博奇" >这个说不好</a></li>
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