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Making the world better, one answer at a time. Red blood cells are found in arteries, veins, ventricles, and the heart. If red blood cells are found outside of these areas, there is usually a problem.Veins and arteries are found all around the body. Ventricles are found in the heart.aking the world better, one answer at a time. Red blood cells are found in arteries, veins, ventricles, and the heart. If red blood cells are found outside of these areas, there is usually a problem.
Red blood cells are red because they contain an iron-rich protein known as hemoglobin, which is bright red in color. Over time, red blood cells wear out and die. The bone marrow continually makes more red blood cells. Certain foods increase production of red blood cells.