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It depends on what kind of control you are talking about.

Blood vessel walls keep the blood traveling in the right path.

Valves in the heart and veins keep it moving in the right direction in each vessel.

The spleen and kidneys filter and remove impurities and waste products.

The intestines add nutrients to be carried to the various body cells.

The lungs add oxygen to be carried to the various body cells.

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14y ago

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