[{"@context":"https:\/\/schema.org\/","@type":"Article","@id":"https:\/\/www.ibright.cz\/medved-nehibernuje\/#Article","mainEntityOfPage":"https:\/\/www.ibright.cz\/medved-nehibernuje\/","headline":"Medv\u011bd nehibernuje","name":"Medv\u011bd nehibernuje","description":"Kdo z n\u00e1s se n\u011bkdy tou\u017eebn\u011b nezasnil, kdy\u017e sly\u0161el o medv\u011bdovi, kter\u00fd prosp\u00ed celou zimu. Na p\u016fl roku n\u011bkam zal\u00e9zt a jen sp\u00e1t. To mus\u00ed b\u00fdt pohoda. Jak je to ale se zimn\u00edm sp\u00e1nkem u medv\u011bd\u016f ve skute\u010dnosti? Odborn\u00edci dlouho nem\u011bli jistotu v tom, jak vlastn\u011b zimn\u00ed sp\u00e1nek u medv\u011bd\u016f prob\u00edh\u00e1. &#8211;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Jestli je to ... <a href=\"https:\/\/www.ibright.cz\/medved-nehibernuje\/\" class=\"more-link\">P\u0159e\u010d\u00edst<span class=\"screen-reader-text\"> \"Medv\u011bd nehibernuje\"<\/span> &raquo;<\/a>","datePublished":"2025-03-04","dateModified":"2023-04-27","author":{"@type":"Person","@id":"https:\/\/www.ibright.cz\/author\/devene\/#Person","name":"devene","url":"https:\/\/www.ibright.cz\/author\/devene\/","identifier":1,"image":{"@type":"ImageObject","@id":"https:\/\/secure.gravatar.com\/avatar\/53c590fdd1ec24ee297a15a00a0829b5191e9163e4cc5dbbee20ed40fcc30ad9?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/53c590fdd1ec24ee297a15a00a0829b5191e9163e4cc5dbbee20ed40fcc30ad9?s=96&d=mm&r=g","height":96,"width":96}},"publisher":{"@type":"Organization","name":"ibright.cz","logo":{"@type":"ImageObject","@id":"\/logo.png","url":"\/logo.png","width":600,"height":60}},"image":{"@type":"ImageObject","@id":"https:\/\/www.ibright.cz\/wp-content\/uploads\/img_a288399_w2084_t1498752027.png","url":"https:\/\/www.ibright.cz\/wp-content\/uploads\/img_a288399_w2084_t1498752027.png","height":0,"width":0},"url":"https:\/\/www.ibright.cz\/medved-nehibernuje\/","wordCount":397,"articleBody":"Kdo z n\u00e1s se n\u011bkdy tou\u017eebn\u011b nezasnil, kdy\u017e sly\u0161el o medv\u011bdovi, kter\u00fd prosp\u00ed celou zimu. Na p\u016fl roku n\u011bkam zal\u00e9zt a jen sp\u00e1t. To mus\u00ed b\u00fdt pohoda. Jak je to ale se zimn\u00edm sp\u00e1nkem u medv\u011bd\u016f ve skute\u010dnosti? Odborn\u00edci dlouho nem\u011bli jistotu v tom, jak vlastn\u011b zimn\u00ed sp\u00e1nek u medv\u011bd\u016f prob\u00edh\u00e1.&#8211;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Jestli je to jen sp\u00e1nek nebo hibernace.Pokud zv\u00ed\u0159e hibernuje, jeho t\u011blesn\u00e1 teplota jde rapidn\u011b dol\u016f.U medv\u011bd\u016f to ale tak nen\u00ed. Oni si zachov\u00e1vaj\u00ed celkem vysokou t\u011blesnou teplotu. Tady tedy p\u016fjde o n\u011bco jin\u00e9ho. Zv\u00ed\u0159ata, kter\u00e1 hibernuj\u00ed, musej\u00ed velkou \u010d\u00e1st energie v\u011bnovat na navr\u00e1cen\u00ed organismu do p\u016fvodn\u00ed teploty. Medv\u011bd tuto n\u00e1ro\u010dnou techniku vynech\u00e1v\u00e1. V\u00fdzkum prob\u00edhal u alja\u0161sk\u00fdch baribal\u016f, kter\u00fdm zbudovali um\u011bl\u00e9 brlohy.Pak jim m\u011b\u0159ili&#8211;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 teplotu&#8211;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 spot\u0159ebu kysl\u00edku&#8211;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 dech&#8211;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 tep.Zjistili, \u017ee jejich t\u011blesn\u00e1 teplota skute\u010dn\u011b v\u00fdrazn\u011b nekles\u00e1.\tMedv\u011bdi si um\u011bj\u00ed poru\u010ditZaj\u00edmav\u00e9 je, \u017ee medv\u011bdice, kter\u00e9 zab\u0159ezly na podzim, vrhnou ml\u00e1\u010fata pr\u00e1v\u011b b\u011bhem zimn\u00edho sp\u00e1nku.o\u00a0\u00a0 Z\u00e1rodek dok\u00e1\u017ee zastavit sv\u016fj dal\u0161\u00ed v\u00fdvoj a\u017e do doby, kdy matka k tomuto zimn\u00edmu odpo\u010dinku uleh\u00e1.o\u00a0\u00a0 Sp\u00edc\u00ed samice utlum\u00ed metabolismus, ale jej\u00ed t\u011blesn\u00e1 teplota z\u016fst\u00e1v\u00e1 stejn\u00e1.o\u00a0\u00a0 Plod m\u00e1 tedy ide\u00e1ln\u00ed podm\u00ednky ke sv\u00e9mu zd\u00e1rn\u00e9mu v\u00fdvoji.Dal\u0161\u00ed ot\u00e1zka byla, pro\u010d se medv\u011bd net\u0159ese zimou. A to ani v tom p\u0159\u00edpad\u011b, \u017ee ochlad\u00ed sv\u016fj organismus na t\u0159icet stup\u0148\u016f celsia. T\u0159as sval\u016f m\u00e1 u \u010dlov\u011bka funkci oh\u0159\u00edv\u00e1n\u00ed. T\u00edm, \u017ee se svaly ot\u0159\u00e1saj\u00ed, vznik\u00e1 teplo. Jedinou pomoc\u00ed je p\u0159\u00edsun tepla. Ani sebesiln\u011bj\u0161\u00ed v\u016fle nedok\u00e1\u017ee tento klepot zvl\u00e1dnout. Medv\u011bdi se net\u0159esou proto, \u017ee jejich mozkov\u00e9 centrum se p\u0159ed zimn\u00edm sp\u00e1nkem p\u0159enastav\u00ed na ni\u017e\u0161\u00ed teplotu. Jednodu\u0161e \u0159e\u010deno \u2013 mozek p\u0159esv\u011bd\u010d\u00ed t\u011blo, \u017ee je mu teplo a t\u011blo si to pak tak\u00e9 mysl\u00ed. Zaj\u00edmav\u00e9 je, \u017ee nap\u0159\u00edklad tuleni dok\u00e1\u017e\u00ed tak\u00e9 svalov\u00fd t\u0159as zvl\u00e1dnout. Kdy\u017e z mraziv\u00e9 vody vylezou na studen\u00fd vzduch, t\u0159as jednodu\u0161e vypnou.                                                                                                                                                                                                                                                                                                                                                                                                "},{"@context":"https:\/\/schema.org\/","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Medv\u011bd nehibernuje","item":"https:\/\/www.ibright.cz\/medved-nehibernuje\/#breadcrumbitem"}]}]