{"id":58141,"date":"2019-05-01T11:41:20","date_gmt":"2019-05-01T09:41:20","guid":{"rendered":"https:\/\/jagdverband.it\/warum-enten-im-winter-nicht-auf-dem-eis-festfrieren-copy\/"},"modified":"2022-03-09T08:23:54","modified_gmt":"2022-03-09T07:23:54","slug":"piedi-freddi-cuore-caldo","status":"publish","type":"post","link":"https:\/\/jagdverband.it\/it\/piedi-freddi-cuore-caldo\/","title":{"rendered":"Piedi freddi, cuore caldo"},"content":{"rendered":"

[et_pb_section fb_built=”1″ specialty=”on” _builder_version=”3.22″ saved_tabs=”all” global_colors_info=”{}”][et_pb_column type=”3_4″ specialty_columns=”3″ _builder_version=”3.25″ custom_padding=”|||” global_colors_info=”{}” parallax__hover=”off” parallax_method__hover=”on” custom_padding__hover=”|||”][et_pb_row_inner column_structure=”1_2,1_2″ _builder_version=”3.25″ custom_padding=”18px|0px|0|0px|false|false” global_colors_info=”{}”][et_pb_column_inner type=”1_2″ saved_specialty_column_type=”3_4″ _builder_version=”3.25″ custom_padding=”|||” global_colors_info=”{}” parallax__hover=”off” parallax_method__hover=”on” custom_padding__hover=”|||”][et_pb_text _builder_version=”4.0.9″ global_colors_info=”{}”]<\/p>\n

Piedi freddi, cuore caldo<\/h1>\n

Si potrebbe pensare che l\u2019inverno, con gli specchi d\u2019acqua che gelano e gli uccelli che devono stare ore con i piedi sul ghiaccio o nuotare in acque gelide, sia una stagione molto dura per gli uccelli acquatici. In realt\u00e0, il freddo non rappresenta per loro alcun problema.
Le zampe di anatre, oche e altri acquatici hanno una particolare conformazione anatomica. Le arterie provenienti dal cuore e le vene provenienti dai piedi sono posizionate molto vicine nelle zampe degli uccelli. In questo modo il sangue freddo proveniente dai piedi viene riscaldato da quello caldo arterioso, proveniente dal cuore, prima di raggiungere le altre parti del corpo. Grazie a questo accorgimento anatomico si minimizzano le perdite di calore e gli uccelli possono mantenere le parti centrali del corpo calde. Questo sistema presenta un ulteriore vantaggio: il sangue caldo proveniente dal cuore e diretto alle zampe viene raffreddato prima di arrivarvi, in modo tale che la temperatura delle zampe sia sempre di pochi gradi superiore a quella esterna. Se le zampe delle anatre fossero calde, finirebbero per sciogliere il ghiaccio su cui poggiano e gli uccelli rischierebbero di restare con le zampe congelate sul ghiaccio. Chiunque abbia provato a leccare con la lingua un oggetto metallico gelato conosce quest\u2019effetto doloroso che solitamente scatena l\u2019ilarit\u00e0, soprattutto fra i bambini.<\/p>\n

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Altri argomenti:<\/h1>\n

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Le zampe degli uccelli acquatici hanno una particolare conformazione che impedisce loro di gelare o di rimanere attaccati al ghiaccio…<\/p>\n","protected":false},"author":1,"featured_media":58165,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":""},"categories":[138],"tags":[],"featured_image_src":"https:\/\/jagdverband.it\/wp-content\/uploads\/2019\/05\/Enten1-1.jpg","blog_images":{"medium":"https:\/\/jagdverband.it\/wp-content\/uploads\/2019\/05\/Enten1-1-300x188.jpg","large":"https:\/\/jagdverband.it\/wp-content\/uploads\/2019\/05\/Enten1-1.jpg"},"ams_acf":[],"yoast_head":"\nPiedi freddi, cuore caldo - S\u00fcdtiroler Jagdverband<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jagdverband.it\/it\/piedi-freddi-cuore-caldo\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Piedi freddi, cuore caldo - 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