{"id":107742,"date":"2018-02-17T16:10:00","date_gmt":"2018-02-17T16:10:00","guid":{"rendered":""},"modified":"2023-01-08T10:37:52","modified_gmt":"2023-01-08T10:37:52","slug":"chemoreceptorii-3","status":"publish","type":"post","link":"https:\/\/cvnextjob.com\/index.php\/2018\/02\/17\/chemoreceptorii-3\/","title":{"rendered":"Chemoreceptorii"},"content":{"rendered":"
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Intervin \u00een special \u00een reglarea \u015fi adaptarea ventila\u0163iei pulmonare dar ca aceasta s\u0103 fie eficient\u0103 este necesar s\u0103 fie \u00eenso\u0163it\u0103 de modific\u0103ri cardiovasculare.<\/span><\/div>\n
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Chemoreceptorii periferici<\/span><\/div>\n
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Sunt celule chemosensibile extrem de vascularizate (2000 ml\/min.\/100g \u0163esut )prev\u0103zute cu capilare  fenestrate cu o bogat\u0103 inerva\u0163ie simpatic\u0103.<\/span><\/div>\n
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            Chemoreceptorii sinocarotidieni<\/span><\/div>\n
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Sunt situa\u0163i la bifurca\u0163ia carotidei comune \u00een corpusculul sau glomusul carotidian (av\u00e2nd diametru de 1-2 mm \u015fi greutate de 2mg). Sunt prezente insule celulare chemoreceptoare (tip I) \u015fi celule de sus\u0163inere probabil celule gliale<\/span><\/div>\n
 (tip II) \u00eenconjurate de capilare sinusoide fenestrate \u015fi fibre nervoase vegetative slab mielinizate.<\/span><\/div>\n
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                        Chemoreceptorii aortici<\/span><\/div>\n
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            Sunt situa\u0163i \u00een apropierea crosei aortice.<\/span><\/div>\n
 Stimulul principal al chemoreceptorilor este sc\u0103derea Pa O2 cu app. 500 torri (ce corespunde la o sc\u0103dere a presiuni s\u00e2ngelui de 80mmHg situa\u0163ie c\u00e2nd diminueaz\u0103 aportul de O2 la nivelul glomusului nivel de c\u00e2teva ori superior celui la care apar tulbur\u0103ri metabolice tisulare), desc\u0103rc\u0103rile cresc\u00e2nd progresiv pe m\u0103sur\u0103 ce scade Pa O2 . De asemenea intervin Pa CO2 (20-60 torri).<\/span><\/div>\n
            Stimularea chemoreceptorilor aortici spre deosebire de cei sinocarotidieni nu sunt activa\u0163i de cre\u015fterea pH-ului fiind chiar deprima\u0163i.<\/span><\/div>\n
            Stimularea chemoreceptorilor determin\u0103 cre\u015fterea ventila\u0163iei \u015fi secundar cre\u015fterea frecven\u0163ei cardiace \u015fi a presiunii sanguine. R\u0103spunsul hemodinamic al chemoreceptorilor devine important \u00een st\u0103ri urgente de hipoxemie sever\u0103 sau efort fizic m\u0103rit.<\/span><\/div>\n
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                        Chemoreceptorii bulbari <\/span><\/div>\n
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            Sunt situa\u0163i pe fa\u0163a ventral\u0103 \u00een apropierea r\u0103d\u0103cinii nervilor cranieni IX, X, XI ocup\u00e2nd o arie de 5-6mm2 \u015fi o por\u0163iune de 200-400\u00b5m.<\/span><\/div>\n
Studii recente eviden\u0163iaz\u0103 de fapt trei zone cu activitate chemoreceptoare:<\/span><\/div>\n
1.   pe fa\u0163a ventral\u0103 delimitat lateral de piramide \u015fi medial de r\u0103d\u0103cinile nervilor VII-X, fiind cea mai bine localizat\u0103;<\/span><\/div>\n
2.   caudal de prima delimitare: lateral de piramide \u015fi medial de r\u0103d\u0103cina nervului XII;<\/span><\/div>\n
3.   \u00eentre cele dou\u0103.<\/span><\/div>\n
Chemoreceptorii bulbari sunt sensibili la modific\u0103rile de pH extracelular \u015fi a<\/span><\/div>\n
LCR.<\/span><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Intervin \u00een special \u00een reglarea \u015fi adaptarea ventila\u0163iei pulmonare dar ca aceasta s\u0103 fie eficient\u0103 este necesar s\u0103 fie \u00eenso\u0163it\u0103 de modific\u0103ri cardiovasculare. Chemoreceptorii periferici Sunt celule chemosensibile extrem de vascularizate (2000 ml\/min.\/100g \u0163esut )prev\u0103zute cu capilare  fenestrate cu o bogat\u0103 inerva\u0163ie simpatic\u0103.             Chemoreceptorii sinocarotidieni Sunt situa\u0163i la bifurca\u0163ia carotidei comune \u00een corpusculul sau […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/cvnextjob.com\/index.php\/wp-json\/wp\/v2\/posts\/107742"}],"collection":[{"href":"https:\/\/cvnextjob.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cvnextjob.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cvnextjob.com\/index.php\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/cvnextjob.com\/index.php\/wp-json\/wp\/v2\/comments?post=107742"}],"version-history":[{"count":0,"href":"https:\/\/cvnextjob.com\/index.php\/wp-json\/wp\/v2\/posts\/107742\/revisions"}],"wp:attachment":[{"href":"https:\/\/cvnextjob.com\/index.php\/wp-json\/wp\/v2\/media?parent=107742"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cvnextjob.com\/index.php\/wp-json\/wp\/v2\/categories?post=107742"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cvnextjob.com\/index.php\/wp-json\/wp\/v2\/tags?post=107742"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}