What is the function (purpose) of the valves which connect the heart chambers? allows blood to flow between the two atria
allows blood to flow between the two ventricles
allows blood to flow from the atria to the ventricle

The valves prevent the backward flow of blood. These valves are actual flaps that are located on each end of the two ventricles (lower chambers of the heart). They act as one-way inlets of blood on one side of a ventricle and one-way outlets of blood on the other side of a ventricle.

Explanation:

answer; /// i believe that the correct answer is (c); ///when the lungs expand, they fill with air from the atmosphere;

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