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The circulatory system is responsible for transporting nutrients, water, and oxygen to body cells and consists of three main parts: the heart, blood, and blood vessels. The heart pumps approximately 3 billion times in a lifetime and is about the size of a fist, while blood carries essential substances and waste products throughout the body. Blood cells are produced in the bone marrow, and there are three types of blood vessels: arteries, capillaries, and veins, each serving distinct functions.

Author

serggmaestrocarra

Language

EN