The diaphragm separates the thoracic cavity containing the heart and lungs, from the abdominal cavity and performs an important function in respiration: as the diaphragm contracts, the volume of the thoracic cavity increases and air is drawn into the lungs.he superior surface of the dome forms the floor of the thoracic cavity, and the inferior surface the roof of the abdominal cavity. As a dome, the diaphragm has peripheral attachments to structures that make up the abdominal and chest walls.
A American Heart Association-Stroke Association answered. The four valves in your heart are made of thin (but strong) flaps (cusps) of tissue that open and close as your heart pumps. They make sure that blood flows through your heart in the right direction. Your valves work hard as they stretch back and forth with every heartbeat.
Mitral valve is one of the valves of the heart, whose function is to keep the blood flowing in one direction through the left side of the heart and to prevent backflow of blood when the heart contracts. Itâs named for its shape, which resembles a tall bishopâs hat called a miter.here is at the same time less to it and more to it than at first appears. Mitral valve prolapse is named for a heart valve and is usually first diagnosed as a faint heart âclickâ or murmur, though it isnât a form of âheart diseaseâ in any conventional sense.