1.Two upper chambers of the heart (collecting chambers)
2.blood vessels that carry blood AWAY from the heart
3.lung
4.thick wall of tissue that separates the heart into right and left sides
5.located in the right atrium sends out signals that regulate the heart beat rate
6.microscopic, one all thick, vessels that connect veins and arteries. (Swiss cheese)
7.blood vessels that carry blood toward the heart (valves)
8.largest blood vessel, artery, in the body ​