循環系統(sûn-khuân hē-thóng)是生物負責共物送去細胞抑搬走的器官組成的系統,也就是普通時講的心血管系統 (cardiovascular system),循環系統會得幫贊身體保持溫度氫離子濃度(pH)穩定,基本的有3種循環系統:無循環系統 (no circulatory system)、開放循環系統 (open circulatory system)佮封閉循環系統 (closed circulatory system)。

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