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鲨鱼是怎样进行呼吸的

更新时间: 2020-09-16 00:00:00     

鲨鱼是以外胚层形成的鳃来进行呼吸作用的,又不同于其它的鱼类,不能像其他硬骨鱼的鳃盖那样能直接溶解水中的氧气再吸收到血液中。鲨鱼每侧有五到七个鳃裂,在游动时海水通过半开的口吸入,从鳃裂流出进行气体交换。鳃具有壁薄、面积大而又联系着丰富的血管的特点,入鳃的血是缺氧血,而出鳃的血是多氧血。鲨鱼的呼吸动作是依靠鳃节肌的张缩,造成口的开关、鳃弓的扩张与收缩以促使水的通入与流出。

关键词: 鲨鱼 怎样 进行 呼吸

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