The Richter scale doesn't measure quake damage (see: Mercalli Scale) which is dependent on a variety of factors including population at the epicentre, terrain, depth, etc.
The circulatory system works with the muscular system, the nervous system, and the digestive system. The heart is a muscle so it is part of the muscular system. Also the heart and lungs have nerves so it is also part of the nervous system.
Circulatory System. The primary job of the circulatory system is transporting materials through the body. It carries nutrients, oxygen and water to different cells in the body and removes wastes the cells create. The main parts of the circulatory system are the heart, blood, and blood vessels.