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身體器官與功能-循環、消化、呼吸與泌尿系統

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本次影片將介紹循環、消化、呼吸與泌尿系統。

循環系統由血液、心臟和血管所組成。 血液能運送身體各部位營養;心臟是血液循環的幫浦;體熱由血液帶到身體其他部位。血液由紅血球、白血球、血小板與血漿所組成,其各自扮演不同角色與功能。

冠狀動脈主要為提供心肌養分。大部分心臟的毛病都是冠狀動脈因痙攣或阻塞而導致心肌缺氧,所以表現的癥狀可能為胸口緊悶、呼吸困難或胸痛,這是重要的警訊。

呼吸為供應細胞氧氣與從細胞移除二氧化碳的過程,呼吸系統的構造包括鼻、咽、喉、氣管、支氣管及肺臟。

消化系統中的消化道器官由上而下依序為: 口腔、咽、食道、胃、小腸、 大 腸、肛門,消化系統由口腔開始,食物經咀嚼、吞嚥至胃部,經小腸消化及吸收,最後大腸負責吸收水分,剩餘即糞便,送到直腸經肛門排出。

泌尿系統包括腎臟、輸尿管、膀胱、 尿道。

學習本影片後將能掌握人體血液中的紅血球的功能、冠狀動脈的主要功能、呼吸系統的構造、食物消化的過程、泌尿系統包括的器官等內容。

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