ࡱ>  -bjbjBrBr B   BBGPGPGPGPGP[P[P[P8P P[PPPPPPQ6QR yGPRQQRRGPGPPPRRRRGPPGPPRRRRtP5Q8[PRP0PHRGP RRRRRRRRRRRRRRRRRRRRRRRRRB O:  Conclusion What are two differences you see when comparing the four chambers of the heart? Relate these differences to the function of each chamber. Right atrium receives oxygen-depleted blood from the body via the superior vena cava and the inferior vena cava and pumps it through the tricuspid valve into the right ventricle. Right ventricle receives oxygen-depleted blood from the right atrium and pumps it through the pulmonary valve into the lungs via the pulmonary artery. Left atrium receives oxygen-rich blood from the lungs via the pulmonary veins and pumps it through the mitral valve into the left ventricle. Left ventricle receives oxygen-rich blood from the left atrium and pumps it through the aortic valve to be delivered throughout the body, including to the heart muscle itself via the coronary arteries. Describe how the structure of the aorta relates to its function in the heart. It takes the blood to the body What structural differences did you notice between arteries and veins? Relate these differences to the function of the vessels. The walls of veins have three layers of tissues like the arteries but veins are much thinner and less elastic than arteries.Veins have valves that help in the process of returning blood to the heart by preventing blood from flowing reverse. Annas autopsy report noted mitral valve prolapse. This means that the mitral valve does not close properly. Explain why this could be a problem. The systemic circulation is affected when the mitral valv is not functioning correctly. Using what you have learned about the structure and function of the heart, explain why left ventricular hypertrophy can be fatal if left untreated. The enlarged heart muscle loses its elasticity, meaning that it does not pump blood out of the heart effectively leading to increased pressure within the heart. The enlarged muscle compresses its supply of blood vessels, reducing blood flow to the heart muscle. These can lead to arrhythmias of the heart, heart failure,HYPERLINK "http://wiki.answers.com/Q/Is_left_ventricular_hypertrophy_fatal"heart attack, insufficient oxygen supply to the heart, and the worst case scenario is it can lead to cardiac arrest (sudden loss of heart function and breathing) Now that you have seen a heart up close, explain how the actual structure differs from your heart box study tool. It shows where the veins and arteries are.      Project Lead The Way, Inc. 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