Chambers of heart.
The heart can be compared to a four room apartment or house. An apartment has doors between rooms, so does the heart have valves. Just like doors, the valves open in a certain direction when blood flows through them. If the heart valves open in the reverse direction and blood flows in a reverse direction, it is a sign of heart disease. In an apartment we many freely move to any room, but the blood in our heart can move only in a predefined direction, between predefined chambers. If the blood flows into the wrong direction and in the wrong chambers, that could be a sign of heart disease too. Lastly, the rooms in an apartment have walls. The chambers of our heart also have walls. Rarely, these walls may have openings or a weakness in them, another sign of heart disease.
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