Respiración

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Los dos pulmones son los órganos principales del aparato respiratorio. Otros componentes del aparato respiratorio llevan aire a los pulmones, como la tráquea, que se ramifica en estructuras más pequeñas llamadas bronquios. El proceso de respiración se divide en dos fases distintas: la inspiración (inhalación) y la espiración (exhalación). Durante la inspiración, el diafragma se contrae y baja, mientras que los músculos entre las costillas se contraen y suben. Esto aumenta el tamaño de la caja torácica y reduce la presión interna. Como resultado de esto, el aire se precipita hacia adentro y llena los pulmones. Durante la espiración, el diafragma se relaja y el volumen de la caja torácica disminuye, a la vez que la presión dentro de ésta aumenta. En consecuencia, los pulmones se contraen y el aire es expulsado hacia afuera.

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  • Last reviewed on 11/10/2012
  • David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by A.D.A.M. Health Solutions, Ebix, Inc., Editorial Team: David Zieve, MD, MHA, David R. Eltz, Stephanie Slon, and Nissi Wang.

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This page was last updated: May 20, 2014

         
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