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	<title>十万个为什么 &#187; 人体</title>
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		<title>为什么血能在人体中流动？</title>
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		<pubDate>Mon, 27 Dec 2010 02:00:43 +0000</pubDate>
		<dc:creator>jackly</dc:creator>
				<category><![CDATA[人体的奥秘]]></category>
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		<description><![CDATA[血液是像水一样的液体，必须在固定的管道（血管）中流动，血管从心脏开始，由粗到细， 由长到短， 渐渐变成肉眼看不清的毛细血管。血管分为动脉血管和静脉血管两大类，它们之间的不同之处是，动脉中流动的是“干净”血液，而静脉却只输送“含废物”的血液。当我们的心脏用力压缩时就像一个泵，把心脏内的血液挤压出来，这时候的血液是含有丰富氧气和营养物质的“干净”血，它通过动脉流向密布于体内的毛细血管中， 把血液中的氧气和营养物质送给人体中的细胞， 提供它们呼吸和 “吃喝” 。 与此同时，细胞把排出的废物和二氧化碳送入到血管中，于是， “干净”血就变成了“含废物”血，流入到静脉血管中，通过肺、肾和皮肤把废物废气排出体外，使血液重新变得干净而返回心脏。 相关文章为什么皮肤划破后血会自动凝结？(2) 为什么血是红色的？(3) 为什么说大脑是人体的指挥中心？(0) 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>血液是像水一样的液体，必须在固定的管道（血管）中流动，血管从心脏开始，由粗到细， 由长到短， 渐渐变成肉眼看不清的毛细血管。血管分为动脉血管和静脉血管两大类，它们之间的不同之处是，动脉中流动的是“干净”血液，而静脉却只输送“含废物”的血液。当我们的心脏用力压缩时就像一个泵，把心脏内的血液挤压出来，这时候的血液是含有丰富氧气和<span class='bm_keywordlink_affiliate'><a href="http://www.10why.net/tag/营养" target="_blank">营养</a></span>物质的“干净”血，它通过动脉流向密布于体内的毛细血管中， 把血液中的氧气和营养物质送给<span class='bm_keywordlink_affiliate'><a href="	 http://www.10why.net/tag/人体" target="_blank">人体</a></span>中的细胞， 提供它们呼吸和 “吃喝” 。<br />
与此同时，细胞把排出的废物和二氧化碳送入到血管中，于是， “干净”血就变成了“含废物”血，流入到静脉血管中，通过肺、肾和皮肤把废物废气排出体外，使血液重新变得干净而返回心脏。</p>
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</table><h3>相关文章</h3><ul><li><a href="http://www.10why.net/20110712/pi-fu-hua-po/" title="为什么皮肤划破后血会自动凝结？ 2011.07.12">为什么皮肤划破后血会自动凝结？</a>(2)</li>
<li><a href="http://www.10why.net/20110708/xue/" title="为什么血是红色的？ 2011.07.8">为什么血是红色的？</a>(3)</li>
<li><a href="http://www.10why.net/20080609/da-nao-zhi-hui-zhong-xin/" title="为什么说大脑是人体的指挥中心？ 2008.06.9">为什么说大脑是人体的指挥中心？</a>(0)</li>
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		<title>为什么说大脑是人体的指挥中心？</title>
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		<pubDate>Mon, 09 Jun 2008 04:06:43 +0000</pubDate>
		<dc:creator>jackly</dc:creator>
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		<description><![CDATA[&#160;    人类的每个组成器官都复杂而精密，它们工作得十分协调、和谐、有条不紊，这是因为它们都受着神经系统“司令部”——“脑”的统一指挥。大脑位于脑的最上端，形状有点像核桃仁，体积很大，占据了脑的大部分，通常分为左右两部分，每一部分都称为大脑半球。 每一大脑半球表面 （大脑皮质） 又分额叶、顶叶、枕叶和颞叶。如：额叶后部为运动区，顶叶前部为躯体感觉区（分触、压、冷、热等感觉） ，颞叶上部为听觉区。 每一大脑半球管理身体的对侧部分， 即左侧大脑半球管理身体的右侧部分，右侧大脑半球管理左侧身体的运动和感觉。有人得了“半身不遂” 病， 若右侧身体瘫痪则是左侧大脑半球神经通道受到损伤， 若左侧身体瘫痪， 则是右侧大脑半球通道发生了障碍。 正常的脑重应该是多少？ 一个健康的成年人，男的脑重不低于1000克， 女的不低于900克，就不会影响智力的发展。 &#160; 相关文章为什么血能在人体中流动？(0) 脑袋大的人一定聪明吗？(6) 为什么说脑子越用越好使？(3) 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>&nbsp;</p>
<div class="mceTemp"> </div>
<p> <span class='bm_keywordlink_affiliate'><a href="http://www.10why.net/tag/人类" target="_blank">人类</a></span>的每个组成器官都复杂而精密，它们工作得十分协调、和谐、有条不紊，这是因为它们都受着神经系统“司令部”——“脑”的统一指挥。<span class='bm_keywordlink_affiliate'><a href="http://www.10why.net/tag/大脑" target="_blank">大脑</a></span>位于脑的最上端，形状有点像核桃仁，体积很大，占据了脑的大部分，通常分为左右两部分，每一部分都称为大脑半球。 每一大脑半球表面 （大脑皮质） 又分额叶、顶叶、枕叶和颞叶。如：额叶后部为运动区，顶叶前部为躯体感觉区（分触、压、冷、热等感觉） ，颞叶上部为听觉区。 每一大脑半球管理身体的对侧部分， 即左侧大脑半球管理身体的右侧部分，右侧大脑半球管理左侧身体的运动和感觉。有人得了“半身不遂” 病， 若右侧身体瘫痪则是左侧大脑半球神经通道受到损伤， 若左侧身体瘫痪， 则是右侧大脑半球通道发生了障碍。</p>
<blockquote><p>正常的脑重应该是多少？<br />
一个健康的成年人，男的脑重不低于1000克， 女的不低于900克，就不会影响<span class='bm_keywordlink_affiliate'><a href="http://www.10why.net/tag/智力" target="_blank">智力</a></span>的发展。</p></blockquote>
<div id="attachment_8" class="wp-caption alignnone" style="width: 337px"><a href="http://www.10why.net/wp-content/uploads/2008/06/e69caae6a087e9a298-3.jpg"><img class="size-full wp-image-8 " title="大脑2" src="http://www.10why.net/wp-content/uploads/2008/06/e69caae6a087e9a298-3.jpg" alt="" width="327" height="205" /></a><p class="wp-caption-text">大脑2</p></div>
<p>&nbsp;</p>
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