{"id":527327,"date":"2026-11-07T17:26:57","date_gmt":"2026-11-07T17:26:57","guid":{"rendered":"http:\/\/6aecb2825aad9c1c8c8e5b7b"},"modified":"2026-11-07T17:26:57","modified_gmt":"2026-11-07T17:26:57","slug":"el-rojo-no-es-el-unico-color-de-la-sangre","status":"publish","type":"post","link":"https:\/\/sarmiento24h.com\/?p=527327","title":{"rendered":"El rojo no es el \u00fanico color de la sangre"},"content":{"rendered":"<p>Ya sea que brote de una nariz magullada o se acumule en la punta de un dedo pinchado, nuestra sangre tiene alg\u00fan tono de rojo. Pero el color rojo no es universal en el reino animal. En algunas criaturas, el fluido vital es morado; en otras, es amarillo, verde o incluso blanco.<\/p>\n<p>\u00bfQu\u00e9 es lo que le da estos diferentes colores al l\u00edquido de la vida? Para averiguarlo, <em>Knowable Magazine<\/em> se sumergi\u00f3 en la investigaci\u00f3n y habl\u00f3 con un par de cient\u00edficos que han estudiado el tema: John Postlethwait, genetista del desarrollo de la Universidad de Oreg\u00f3n, y Zachary Cheviron, ecofisi\u00f3logo de la Universidad de Montana. Esto es lo que se sabe sobre la ciencia detr\u00e1s de estos tonos.<\/p>\n<h2>Azules y morados extra\u00f1os<\/h2>\n<p>El rojo intenso de la sangre de los vertebrados proviene de la hemoglobina, una prote\u00edna presente en los gl\u00f3bulos rojos que contiene \u00e1tomos de hierro. La funci\u00f3n de la hemoglobina es transportar ox\u00edgeno, y son sus \u00e1tomos de hierro, que se unen al ox\u00edgeno, los que hacen que nuestra sangre se vea roja. Cuando los \u00e1tomos de hierro est\u00e1n unidos al ox\u00edgeno la sangre es de un rojo cereza brillante; cuando hay menos ox\u00edgeno unido, es de un rojo marr\u00f3n m\u00e1s turbio. Pero muchas criaturas no utilizan hemoglobina. Los pulpos y los calamares, por ejemplo, y los crust\u00e1ceos, como los camarones y los cangrejos, dependen de <a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/40925714\/\">una prote\u00edna llamada hemocianina<\/a> para transportar ox\u00edgeno. La hemocianina tiene \u00e1tomos de cobre \u2014que se ven azules cuando se unen al ox\u00edgeno\u2014 en lugar del hierro de la hemoglobina.<\/p>\n<p>La hemocianina no se une al ox\u00edgeno tan eficientemente como lo hace la hemoglobina. Sin embargo, funciona especialmente bien a bajas temperaturas, como las que se encuentran en las profundidades del oc\u00e9ano. Adem\u00e1s, puede desempe\u00f1ar m\u00e1s funciones que solo transportar ox\u00edgeno en las criaturas que la utilizan; las investigaciones sugieren que las hemocianinas pueden desempe\u00f1ar un papel en el sistema inmunitario, ayudando, por ejemplo, a sanar heridas.<\/p>\n<figure class=\"AssetEmbedWrapper-iJvQnD cOWUYC asset-embed\">\n<div class=\"AssetEmbedAssetContainer-fnduJP iaVSwI asset-embed__asset-container\"><span class=\"SpanWrapper-kFnjvc eKnjjD responsive-asset AssetEmbedResponsiveAsset-gaAbQ hXaxHA asset-embed__responsive-asset\"><picture class=\"ResponsiveImagePicture-jKunQM gjCCFj AssetEmbedResponsiveAsset-gaAbQ hXaxHA asset-embed__responsive-asset responsive-image\"><img decoding=\"async\" alt=\"color de la sangre\" loading=\"lazy\" class=\"ResponsiveImageContainer-dkeESL cQPiWi responsive-image__image\" srcset=\"https:\/\/media.es.wired.com\/photos\/6aed4329d4f1b1a94bb3cfc9\/master\/w_120,c_limit\/i-horseshoe-crab-and-icefish-kee.jpg 120w, https:\/\/media.es.wired.com\/photos\/6aed4329d4f1b1a94bb3cfc9\/master\/w_240,c_limit\/i-horseshoe-crab-and-icefish-kee.jpg 240w, https:\/\/media.es.wired.com\/photos\/6aed4329d4f1b1a94bb3cfc9\/master\/w_320,c_limit\/i-horseshoe-crab-and-icefish-kee.jpg 320w, https:\/\/media.es.wired.com\/photos\/6aed4329d4f1b1a94bb3cfc9\/master\/w_640,c_limit\/i-horseshoe-crab-and-icefish-kee.jpg 640w, https:\/\/media.es.wired.com\/photos\/6aed4329d4f1b1a94bb3cfc9\/master\/w_768,c_limit\/i-horseshoe-crab-and-icefish-kee.jpg 768w, https:\/\/media.es.wired.com\/photos\/6aed4329d4f1b1a94bb3cfc9\/master\/w_960,c_limit\/i-horseshoe-crab-and-icefish-kee.jpg 960w, https:\/\/media.es.wired.com\/photos\/6aed4329d4f1b1a94bb3cfc9\/master\/w_1280,c_limit\/i-horseshoe-crab-and-icefish-kee.jpg 1280w, https:\/\/media.es.wired.com\/photos\/6aed4329d4f1b1a94bb3cfc9\/master\/w_1600,c_limit\/i-horseshoe-crab-and-icefish-kee.jpg 1600w\" sizes=\"100vw\" src=\"https:\/\/media.es.wired.com\/photos\/6aed4329d4f1b1a94bb3cfc9\/master\/w_1600%2Cc_limit\/i-horseshoe-crab-and-icefish-kee.jpg\"><\/picture><\/span><\/div>\n<div class=\"CaptionWrapper-bpPcvW kzGGxb caption AssetEmbedCaption-eZIMNW gMgneI asset-embed__caption\" data-testid=\"caption-wrapper\" readability=\"8\"><span class=\"BaseText-fEwdHD CaptionText-cQpRdU gZqZYz hbiMYj caption__text\" readability=\"31\"><\/p>\n<p>Los cangrejos herradura (izquierda) sangran de color azul, gracias a la hemocianina rica en cobre, mientras que los peces draco ant\u00e1rticos (derecha) no utilizan una prote\u00edna transportadora de ox\u00edgeno y sangran de un blanco fantasmal.<\/p>\n<p><\/span><span class=\"BaseText-fEwdHD CaptionCredit-cUgOGk fSrqtv hRFzlA caption__credit\">RECHERCHES SUR L\u2019ANATOMIE DES LIMULES 1873 (izquierda); ANTARCTIC FISHES OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION 1913 (derecha) \/ Dominio p\u00fablico<\/span><\/div>\n<\/figure>\n<p>Otras criaturas marinas, como los braqui\u00f3podos \u2014parecidos a las almejas\u2014 y el gusano cacahuete, que habita en el fondo marino, sangran de color violeta, pero no por la hemocianina. En cambio, estas criaturas utilizan un pigmento proteico rico en hierro y de color p\u00farpura <a href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5363010\/\">llamado hemeritrina<\/a> para transportar ox\u00edgeno por toda su sangre.<\/p>\n<h2>En la familia de los verdes<\/h2>\n<p>Algunas ascidias \u2014animales marinos blandos con forma de papa\u2014 sangran de un color amarillo verdoso. No producen hemoglobina, y existe cierto debate sobre qu\u00e9 es lo que les da ese tono amarillento. Una posibilidad es el elemento vanadio, que muchas ascidias concentran en su sangre.<\/p>\n<p>Otra teor\u00eda apunta a la dieta. Cuando las ascidias metabolizan su alimento b\u00e1sico, el fitoplancton marino, producen carotenoides, pigmentos de color amarillo, rojo o naranja.<\/p>\n<p>Existen diferentes mecanismos que pueden hacer que los animales sangren completamente de color verde. Varias especies de lagartos de Nueva Guinea utilizan la hemoglobina para transportar ox\u00edgeno, como suelen hacerlo los vertebrados. Pero luego descomponen la hemoglobina en un pigmento naturalmente verde llamado biliverdina (la misma mol\u00e9cula que, cuando est\u00e1 presente en altas concentraciones, provoca el aspecto amarillo verdoso de la ictericia en las personas). Y a diferencia de la mayor\u00eda de los vertebrados, que metabolizan la biliverdina en otros compuestos m\u00e1s apagados, estos lagartos de Nueva Guinea <a href=\"https:\/\/www.science.org\/doi\/10.1126\/sciadv.aao5017\">acumulan el pigmento en su sangre<\/a> hasta el punto de que su tono verde predomina sobre el rojo de la hemoglobina en el torrente sangu\u00edneo y los tejidos.<\/p>\n<h2>Espeluznante y transparente<\/h2>\n<p>Los peces draco ant\u00e1rticos, de la familia Channichthyidae, son los \u00fanicos vertebrados conocidos que no producen hemoglobina y no tienen gl\u00f3bulos rojos. Su sangre es de un color blanco lechoso y transl\u00facido. \u201cRealmente tienen un aspecto un tanto fantasmal\u201d, dice Postlethwait.<\/p>\n<p>En lugar de hemoglobina o cualquier prote\u00edna equivalente que se una al ox\u00edgeno, los draco ant\u00e1rticos dependen del ox\u00edgeno que se disuelve directamente en su torrente sangu\u00edneo. Tambi\u00e9n tienen corazones y capilares m\u00e1s grandes en comparaci\u00f3n con otros peces ant\u00e1rticos, lo que les permite bombear y hacer circular cantidades de sangre m\u00e1s grandes. Los draco ant\u00e1rticos son depredadores pacientes que cazan al acecho: esperan a su presa en lugar de lanzarse a capturarla, lo que les permite gastar menos energ\u00eda y requerir menos ox\u00edgeno.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ya sea que brote de una nariz&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":527328,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[46],"tags":[],"class_list":["post-527327","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tecnologia"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - 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