{"id":14838,"date":"2020-09-05T15:25:34","date_gmt":"2020-09-05T15:25:34","guid":{"rendered":"https:\/\/www.lifescienceart.com\/?p=14838"},"modified":"2020-09-05T15:25:34","modified_gmt":"2020-09-05T15:25:34","slug":"do-sharks-sleep-and-if-so-how","status":"publish","type":"post","link":"https:\/\/www.lifescienceart.com\/vi\/science\/zoology\/do-sharks-sleep-and-if-so-how\/","title":{"rendered":"C\u00e1 m\u1eadp c\u0169ng ng\u1ee7? Gi\u1ea3i m\u00e3 b\u00ed \u1ea9n gi\u1ea5c ng\u1ee7 c\u1ee7a c\u00e1 m\u1eadp"},"content":{"rendered":"<h2 class=\"wp-block-heading\">C\u00e1 m\u1eadp: Li\u1ec7u ch\u00fang c\u00f3 ng\u1ee7 v\u00e0 n\u1ebfu c\u00f3 th\u00ec ng\u1ee7 nh\u01b0 th\u1ebf n\u00e0o?<\/h2>\n\n<h2 class=\"wp-block-heading\">S\u1ef1 trao \u0111\u1ed5i ch\u1ea5t v\u00e0 t\u01b0 th\u1ebf ti\u1ebft l\u1ed9 gi\u1ea5c ng\u1ee7 \u1edf c\u00e1 m\u1eadp<\/h2>\n\n<p>Trong nhi\u1ec1u th\u1ebf k\u1ef7, c\u00e1c nh\u00e0 khoa h\u1ecdc \u0111\u00e3 tranh lu\u1eadn v\u1ec1 vi\u1ec7c c\u00e1 m\u1eadp c\u00f3 ng\u1ee7 hay kh\u00f4ng. M\u1ed9t s\u1ed1 lo\u00e0i, nh\u01b0 c\u00e1 m\u1eadp tr\u1eafng l\u1edbn v\u00e0 c\u00e1 m\u1eadp h\u1ed5, ph\u1ea3i li\u00ean t\u1ee5c b\u01a1i \u0111\u1ec3 gi\u1eef cho d\u00f2ng n\u01b0\u1edbc c\u00f3 oxy ch\u1ea3y qua mang c\u1ee7a ch\u00fang. \u0110i\u1ec1u n\u00e0y d\u1eabn \u0111\u1ebfn ni\u1ec1m tin r\u1eb1ng c\u00e1 m\u1eadp kh\u00f4ng ng\u1ee7 ch\u00fat n\u00e0o.<\/p>\n\n<p>Tuy nhi\u00ean, c\u00e1c nghi\u00ean c\u1ee9u g\u1ea7n \u0111\u00e2y \u0111\u00e3 l\u1eadt \u0111\u1ed5 gi\u1ea3 \u0111\u1ecbnh t\u1ed3n t\u1ea1i t\u1eeb l\u00e2u n\u00e0y. C\u00e1c nh\u00e0 khoa h\u1ecdc \u1edf \u00dac \u0111\u00e3 ghi l\u1ea1i m\u1ed9t lo\u00e0i c\u00e1 m\u1eadp s\u1ed1ng \u1edf t\u1ea7ng \u0111\u00e1y, c\u00e1 m\u1eadp b\u00e0n c\u1edd, ng\u1ee7 l\u1ea7n \u0111\u1ea7u ti\u00ean.<\/p>\n\n<p>Kh\u00f4ng gi\u1ed1ng nh\u01b0 c\u00e1 m\u1eadp tr\u1eafng l\u1edbn v\u00e0 c\u00e1 m\u1eadp h\u1ed5, c\u00e1 m\u1eadp b\u00e0n c\u1edd l\u00e0 c\u00e1 m\u1eadp c\u00f3 kh\u1ea3 n\u0103ng b\u01a1m n\u01b0\u1edbc b\u1eb1ng m\u00e1. \u0110i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 ch\u00fang c\u00f3 th\u1ec3 t\u1ef1 \u0111\u1ea9y n\u01b0\u1edbc qua mang \u0111\u1ec3 l\u1ea5y oxy trong khi v\u1eabn \u0111\u1ee9ng y\u00ean.<\/p>\n\n<p>\u0110\u1ec3 x\u00e1c \u0111\u1ecbnh xem c\u00e1 m\u1eadp b\u00e0n c\u1edd c\u00f3 th\u1ef1c s\u1ef1 ng\u1ee7 hay kh\u00f4ng, nh\u00f3m nghi\u00ean c\u1ee9u \u0111\u00e3 ph\u00e2n t\u00edch s\u1ef1 trao \u0111\u1ed5i ch\u1ea5t v\u00e0 t\u01b0 th\u1ebf c\u1ee7a ch\u00fang trong 24 gi\u1edd. H\u1ecd ph\u00e1t hi\u1ec7n ra r\u1eb1ng khi c\u00e1 m\u1eadp ngh\u1ec9 ng\u01a1i trong n\u0103m ph\u00fat tr\u1edf l\u00ean, l\u01b0\u1ee3ng oxy ti\u00eau th\u1ee5 c\u1ee7a ch\u00fang gi\u1ea3m \u0111\u00e1ng k\u1ec3, cho th\u1ea5y ch\u00fang \u0111ang ng\u1ee7 thi\u1ebfp \u0111i.<\/p>\n\n<p>Ngo\u00e0i s\u1ef1 s\u1ee5t gi\u1ea3m v\u1ec1 s\u1ef1 trao \u0111\u1ed5i ch\u1ea5t, c\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u c\u0169ng quan s\u00e1t th\u1ea5y nh\u1eefng thay \u0111\u1ed5i v\u1ec1 t\u01b0 th\u1ebf c\u1ee7a c\u00e1 m\u1eadp. Khi ng\u1ee7, c\u00e1 m\u1eadp l\u00e0m ph\u1eb3ng c\u01a1 th\u1ec3 v\u00e0 n\u1eb1m g\u1ea7n h\u01a1n v\u1edbi m\u1eb7t \u0111\u1ea5t.<\/p>\n\n<h2 class=\"wp-block-heading\">Nh\u1eafm m\u1eaft v\u00e0 \u00e1nh s\u00e1ng<\/h2>\n\n<p>\u0110i\u1ec1u th\u00fa v\u1ecb l\u00e0 c\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u ph\u00e1t hi\u1ec7n ra r\u1eb1ng c\u00e1 m\u1eadp b\u00e0n c\u1edd \u0111\u00f4i khi ng\u1ee7 v\u1edbi \u0111\u00f4i m\u1eaft nh\u1eafm nghi\u1ec1n, nh\u01b0ng ch\u1ee7 y\u1ebfu l\u00e0 v\u00e0o ban ng\u00e0y. V\u00e0o ban \u0111\u00eam, ch\u00fang th\u01b0\u1eddng m\u1edf m\u1eaft nhi\u1ec1u h\u01a1n.<\/p>\n\n<p>\u0110i\u1ec1u n\u00e0y khi\u1ebfn c\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u nghi ng\u1edd r\u1eb1ng vi\u1ec7c c\u00e1 m\u1eadp nh\u1eafm m\u1eaft c\u00f3 th\u1ec3 li\u00ean quan nhi\u1ec1u h\u01a1n \u0111\u1ebfn \u00e1nh s\u00e1ng so v\u1edbi tr\u1ea1ng th\u00e1i ng\u1ee7. Kho\u1ea3ng 38% c\u00e1 m\u1eadp m\u1edf m\u1eaft v\u00e0o ban \u0111\u00eam, ngay c\u1ea3 khi ch\u00fang c\u00f3 v\u1ebb nh\u01b0 \u0111ang ng\u1ee7.<\/p>\n\n<h2 class=\"wp-block-heading\">B\u1eb1ng ch\u1ee9ng v\u1ec1 gi\u1ea5c ng\u1ee7 \u1edf c\u00e1 m\u1eadp<\/h2>\n\n<p>S\u1ef1 k\u1ebft h\u1ee3p c\u1ee7a vi\u1ec7c gi\u1ea3m s\u1ef1 trao \u0111\u1ed5i ch\u1ea5t, thay \u0111\u1ed5i t\u01b0 th\u1ebf v\u00e0 gi\u1ea3m kh\u1ea3 n\u0103ng ph\u1ea3n \u1ee9ng v\u1edbi c\u00e1c k\u00edch th\u00edch cung c\u1ea5p b\u1eb1ng ch\u1ee9ng m\u1ea1nh m\u1ebd cho th\u1ea5y c\u00e1 m\u1eadp b\u00e0n c\u1edd th\u1ef1c s\u1ef1 ng\u1ee7.<\/p>\n\n<p>Ph\u00e1t hi\u1ec7n n\u00e0y r\u1ea5t quan tr\u1ecdng v\u00ec n\u00f3 th\u00e1ch th\u1ee9c ni\u1ec1m tin t\u1ed3n t\u1ea1i t\u1eeb l\u00e2u r\u1eb1ng c\u00e1 m\u1eadp kh\u00f4ng ng\u1ee7. N\u00f3 c\u0169ng cung c\u1ea5p nh\u1eefng hi\u1ec3u bi\u1ebft m\u1edbi v\u1ec1 s\u1ef1 ti\u1ebfn h\u00f3a c\u1ee7a gi\u1ea5c ng\u1ee7, v\u00ec c\u00e1 m\u1eadp l\u00e0 lo\u00e0i \u0111\u1ed9ng v\u1eadt c\u00f3 h\u00e0m l\u00e2u \u0111\u1eddi nh\u1ea5t c\u00f2n s\u1ed1ng.<\/p>\n\n<h2 class=\"wp-block-heading\">Nghi\u00ean c\u1ee9u trong t\u01b0\u01a1ng lai<\/h2>\n\n<p>Nh\u00f3m nghi\u00ean c\u1ee9u c\u00f3 k\u1ebf ho\u1ea1ch ti\u1ebfn h\u00e0nh c\u00e1c nghi\u00ean c\u1ee9u s\u00e2u h\u01a1n \u0111\u1ec3 t\u00ecm hi\u1ec3u v\u1ec1 gi\u1ea5c ng\u1ee7 \u1edf c\u00e1c lo\u00e0i c\u00e1 m\u1eadp kh\u00e1c. H\u1ecd c\u0169ng c\u00f3 k\u1ebf ho\u1ea1ch ph\u00e2n t\u00edch ho\u1ea1t \u0111\u1ed9ng n\u00e3o c\u1ee7a c\u00e1 m\u1eadp khi ng\u1ee7 \u0111\u1ec3 t\u00ecm hi\u1ec3u th\u00eam v\u1ec1 tr\u1ea1ng th\u00e1i th\u1ee9c v\u00e0 ngh\u1ec9 c\u1ee7a ch\u00fang.<\/p>\n\n<p>Hi\u1ec3u \u0111\u01b0\u1ee3c c\u00e1ch th\u1ee9c v\u00e0 l\u00fd do t\u1ea1i sao c\u00e1 m\u1eadp ng\u1ee7 s\u1ebd cung c\u1ea5p nh\u1eefng hi\u1ec3u bi\u1ebft quan tr\u1ecdng v\u1ec1 ch\u1ee9c n\u0103ng c\u1ee7a gi\u1ea5c ng\u1ee7 v\u00e0 c\u00e1ch th\u1ee9c gi\u1ea5c ng\u1ee7 ti\u1ebfn h\u00f3a theo th\u1eddi gian.<\/p>\n\n<h2 class=\"wp-block-heading\">Th\u00f4ng tin b\u1ed5 sung<\/h2>\n\n<ul class=\"wp-block-list\">\n<li>C\u00e1 m\u1eadp b\u00e0n c\u1edd l\u00e0 lo\u00e0i s\u0103n m\u1ed3i ph\u1ee5c k\u00edch, th\u01b0\u1eddng s\u0103n m\u1ed3i v\u00e0o ban \u0111\u00eam.<\/li>\n<li>Ch\u00fang s\u1eed d\u1ee5ng kh\u1ea3 n\u0103ng ng\u1ee5y trang c\u1ee7a m\u00ecnh \u0111\u1ec3 h\u00f2a m\u00ecnh v\u00e0o \u0111\u00e1y bi\u1ec3n v\u00e0 ch\u1edd con m\u1ed3i \u0111\u1ebfn g\u1ea7n.<\/li>\n<li>C\u00e1 m\u1eadp b\u00e0n c\u1edd \u0111\u01b0\u1ee3c t\u00ecm th\u1ea5y \u1edf v\u00f9ng n\u01b0\u1edbc ven bi\u1ec3n quanh New Zealand.<\/li>\n<li>Ch\u00fang t\u01b0\u01a1ng \u0111\u1ed1i nh\u1ecf, \u0111\u1ea1t chi\u1ec1u d\u00e0i t\u1ed1i \u0111a kho\u1ea3ng ba feet.<\/li>\n<li>C\u00e1 m\u1eadp b\u00e0n c\u1edd kh\u00f4ng \u0111\u01b0\u1ee3c coi l\u00e0 m\u1ed1i \u0111e d\u1ecda \u0111\u1ed1i v\u1edbi con ng\u01b0\u1eddi.<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>C\u00e1 m\u1eadp: Li\u1ec7u ch\u00fang c\u00f3 ng\u1ee7 v\u00e0 n\u1ebfu c\u00f3 th\u00ec ng\u1ee7 nh\u01b0 th\u1ebf n\u00e0o? S\u1ef1 trao \u0111\u1ed5i ch\u1ea5t v\u00e0 t\u01b0 th\u1ebf ti\u1ebft l\u1ed9 gi\u1ea5c ng\u1ee7 \u1edf c\u00e1 m\u1eadp Trong nhi\u1ec1u&hellip;<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[280],"tags":[73,888,309,361,136],"class_list":["post-14838","post","type-post","status-publish","format-standard","hentry","category-zoology","tag-sharks","tag-sleep","tag-animal-behavior","tag-marine-biology","tag-evolution"],"_links":{"self":[{"href":"https:\/\/www.lifescienceart.com\/vi\/wp-json\/wp\/v2\/posts\/14838","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.lifescienceart.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.lifescienceart.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.lifescienceart.com\/vi\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/www.lifescienceart.com\/vi\/wp-json\/wp\/v2\/comments?post=14838"}],"version-history":[{"count":1,"href":"https:\/\/www.lifescienceart.com\/vi\/wp-json\/wp\/v2\/posts\/14838\/revisions"}],"predecessor-version":[{"id":14839,"href":"https:\/\/www.lifescienceart.com\/vi\/wp-json\/wp\/v2\/posts\/14838\/revisions\/14839"}],"wp:attachment":[{"href":"https:\/\/www.lifescienceart.com\/vi\/wp-json\/wp\/v2\/media?parent=14838"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.lifescienceart.com\/vi\/wp-json\/wp\/v2\/categories?post=14838"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.lifescienceart.com\/vi\/wp-json\/wp\/v2\/tags?post=14838"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}