CIE IGCSE Biology: 复习笔记:9.1.1 Circulatory System

CIE IGCSE Biology: 复习笔记:9.1.1 Circulatory System

Circulatory System

  • The circulatory system is a system of blood vessels with a pump and valves to ensure one-way flow of blood

An example of a circulatory system.

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