They are the tricuspid valve, the mitral valve, the aortic valve and the pulmonic valve. The sound that is heard when listening to a heartbeat is actually the sound of the heart's valves opening and closing. The heart does not use any of the blood that flows through it to nourish itself. The heart and circulatory system are regulated by the central nervous system. A pulse can be felt at the wrist or neck.
Blood pressure is the force that the blood exerts on the walls of the arteries.
The superior vena cava transports blood from the upper portion of the body while the inferior vena cava transports blood from the lower portion of the body. The circulatory system circulates blood throughout the body. Parts of this system include the heart, lymphatic system and blood vessels such as the arteries, veins and capillaries. Inc. All rights reserved. The information provided on this site is intended for your general knowledge only and is not a substitute for professional medical advice or treatment for specific medical conditions.