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.
The circulatory system consists of the heart, blood, and blood vessels, which transport nutrients and oxygen to all cells to keep the body in proper balance. The circulatory system is responsible for moving blood, nutrients, and gases to and from cells to keep the body in proper balance. The important components of the circulatory system have different functions. The blood vessels transport blood to and from the heart, the heart pumps oxygenated blood to the body, and the oxygen, gases, and nutrients exchange in the capillaries. Anything that affects the integrity of the tubing can impair the health of the circulatory system.