Which structure in the heart controls the flow of blood and prevents it from flowing in the wrong direction veins
arteries
O valves
chambers

The tricuspid and mitral valves lie between the atria and ventricles. The aortic and pulmonic valves lie between the ventricles and the major blood vessels leaving the heart. The heart valves work the same way as one-way valves in the plumbing of your home. They prevent blood from flowing in the wrong direction

Explanation:

maybe o valves

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answer(d) call 911;