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Поддержание низкой концентрации солей в организме хрящевых рыб осуществляется благодаря выделению солей почками, а также специализированной ректальной железой, которая соединяется с пищеварительным трактом. Ректальная железа концентрирует и выводит как ионы натрия, так и хлорид-ионы из крови и тканей организма.
Спинной мозг проходит внутри нервных дуг позвонков по всей длине позвоночника рыбы. Аналогично миомерам и позвоночнику, в строении спинного мозга наблюдается сегментация.
Working via Just about every filament are slim blood vessels termed capillaries. Oxygen from the drinking water enters the fish’s blood, and carbon dioxide is expelled to the drinking water, by way of these capillaries.
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Oviparous fish commonly hatch within an underdeveloped state, and have a yolk sac with the egg that provides nutrients until finally the fish is able to feed alone.
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