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	<title>Circolazione Sangue &#187; La Circolazione generale</title>
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	<link>http://www.circolazionesangue.com</link>
	<description>La natura e la scienza per il benessere della vostra circolazione sanguigna</description>
	<pubDate>Wed, 09 Dec 2009 16:44:24 +0000</pubDate>
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		<title>La circolazione delle gambe</title>
		<link>http://www.circolazionesangue.com/la-circolazione-delle-gambe/</link>
		<comments>http://www.circolazionesangue.com/la-circolazione-delle-gambe/#comments</comments>
		<pubDate>Tue, 19 May 2009 08:10:44 +0000</pubDate>
		<dc:creator>admin</dc:creator>
		
		<category><![CDATA[La Circolazione generale]]></category>

		<category><![CDATA[Vene e Circolazione]]></category>

		<category><![CDATA[circolazione]]></category>

		<category><![CDATA[flusso sanguigno]]></category>

		<category><![CDATA[varici]]></category>

		<category><![CDATA[vene]]></category>

		<guid isPermaLink="false">http://www.circolazionesangue.com/?p=120</guid>
		<description><![CDATA[Le arterie sono dei tubicini che veicolano il sangue dal cuore verso la periferia. Il sangue ossigenato dai polmoni raggiunge il cuore, passa nell’aorta attraverso il ventricolo sinistro e quindi, attraverso le arterie iliache,  le femorali, le poplitee e le tibiali, arriva ai piedi. Durante questo lungo viaggio, il sangue cede parte dell’ossigeno ai muscoli e agli altri tessuti e ritorna attraverso un’altra complessa rete di tubicini: le vene.]]></description>
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Le <b style="">arterie</b> sono dei tubicini che veicolano il sangue dal cuore verso la periferia. Il <b style="">sangue</b> ossigenato dai polmoni raggiunge il <b style="">cuore</b>, passa nell&rsquo;aorta attraverso il ventricolo sinistro e quindi, attraverso le <b style="">arterie iliache</b>,<span style="">&nbsp; </span>le <b style="">femorali</b>, le <b style="">poplitee</b> e le <b style="">tibiali</b>, arriva ai piedi. Durante questo lungo viaggio, il sangue cede parte dell&rsquo;ossigeno ai muscoli e agli altri tessuti e ritorna attraverso un&rsquo;altra complessa rete di tubicini: le <b style="">vene</b>.</p>
<p class="MsoNormal">Le <b style="">vene</b> decorrono, quasi sempre, in prossimit&agrave; delle arterie, ma i due sistemi sono completamente separati, cos&igrave; come sono completamente diverse le malattie che interessano il distretto arterioso da quelle che interessano il distretto venoso. Questo aspetto &egrave; da tenere sempre ben presente per evitare di confonderle fra loro o di attribuire ad una tendenza famigliare per <b style="">arteriopatia</b> (malattia delle arterie) una predisposizione per le <b style="">flebopatie </b>(malattia delle vene).</p>
<p class="MsoNormal">Se il cuore rappresenta la pompa principale del sistema arterioso, il piede e la gamba rappresentano la pompa principale del sistema venoso o &ldquo;<b style="">cuore periferico</b>&rdquo;. Infatti la contrazione muscolare durante il movimento determina sulle vene profonde (o interne), comprimendole ritmicamente, la spinta necessaria per il ritorno del sangue venoso al cuore.</p>
<p class="MsoNormal">Ci&ograve; spiega l&rsquo;importanza di un piede e di una gamba sempre in perfetta efficienza. Il piede rappresenta un vero e proprio capolavoro di ingegneria, fondamentale per il benessere di tutto il corpo; &egrave; una struttura complessa e molto robusta. E&rsquo; infatti in grado di sopportare un lavoro pari a 2 milioni e mezzo di chili al giorno. Durante il cammino sui punti di appoggio agiscono forze pari a cinque, sei volte il peso del corpo. Quando la pianta del piede non<span style="">&nbsp; </span>appoggia in modo corretto possono verificarsi ripercussioni fino alla colonna<span style="">&nbsp; </span>vertebrale.</p>
<p class="MsoNormal">Il piede,<span style="">&nbsp; </span>durante la marcia, determina la contrazione delle masse muscolari; qualunque disturbo del piede rende inefficiente la <b style="">pompa venosa muscolare periferica</b><span style="">&nbsp; </span>e, nel tempo, questa disfunzione pu&ograve; favorire la comparsa di danni sul <b style="">sistema venoso</b>.</p>
<p class="MsoNormal">Le <b style="">vene</b> dell&rsquo;arto inferiore sono di due tipi: profonde e superficiali. Quelle profonde sono comprese nei piani anatomici pi&ugrave; interni e nello spessore dei muscoli, ossa e tendini; le loro malattie sono talvolta definite &ldquo;<b style="">varici interne</b>&rdquo; mentre in realt&agrave; esse diventano solo raramente <b style="">varicose</b>.</p>
<p class="MsoNormal">Quelle superficiali sono situate nel tessuto sottocutaneo, sono spesso visibili attraverso la pelle, che fornisce un sostegno insufficiente e quindi sono pi&ugrave; facilmente colpite da <b style="">alterazioni varicose</b> (o <b style="">varici)</b>. I due sistemi sono mantenuti in equilibrio fra loro dalle <b style="">vene perforanti</b>, cos&igrave; denominate perch&eacute; attraversano le fasce muscolari dalla superficie agli strati pi&ugrave; profondi dell&rsquo;arto.</p>
<p class="MsoNormal">Tutte queste <b style="">vene</b> sono fornite di <b style="">valvole </b>che obbligano il sangue a dirigersi in alto, verso il cuore, impediscono i bruschi contraccolpi di pressione in periferia durante esercizi muscolari violenti e svolgono altre funzioni importanti: le <b style="">valvole</b> ad esempio sono la sede principale dei meccanismi di difesa contro le <b style="">trombosi venose</b>.</p>
<p class="MsoNormal">Esiste poi un delicato <b style="">sistema vascolare</b>, costituito da pi&ugrave; <b style="">vasi piccoli</b>, i <b style="">vasi linfatici</b>, e <b style="">ghiandole</b> (<b style="">linfonodi </b>o <b style="">linfoghiandole</b>), situati vicino alle vene, che svolgono il compito di riportare al cuore anche la <b style="">linfa</b>, il liquido che occupa gli spazi fra le varie cellule di tutto il corpo.</p>
<p class="MsoNormal">Fonte : Difendi e cura le tue vene - Collegio italiano di Flebologia - coordinatore Prof. L.<span style="">&nbsp; </span>Corcos</p>
<p class="MsoNormal">&nbsp;</p>
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