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HEART STRUCTURE AND CIRCULATION Q1 Describe the heart sounds you hear Explain the origin of two sounds Two heart sounds are normally heard through a stethoscope on the chest wall lab dap The first sound can be described as soft but resonant and longer then the second one This sound is associated with the closure of AV valves atrioventricular valves at the beginning of systole The second sound is louder and sharp It is associated with closure of the pulmonary and aortic valves semilunar valves at the beginning of diastole There is a pause between the each set of sounds It is a period of total heat relaxation called quiescent period Q2 Which structures are responsible for these sounds If these structures were damaged or functionally incorrectly what do you think would happen to the heart sound The structures responsible for these sounds are pulmonary aortic and atrioventricular valves These sounds are results of vibration caused by closure of these valves Other sounds known as heart murmurs are sometimes a sign of heart disease Murmurs can be produced by blood flowing rapidly in the usual directions through an abnormally narrowed valve Vander Sherman and Luciano 1985 p326 and in some cases as mitral valve prolapse the individual does not show any symptoms Q5 If a glass probe is poked into the pulmonary trunk which chamber will it enter The glass probe poked into the pulmonary trunk will follow the cycle of blood from the pulmonary artery to the lungs and then through pulmonary veins will enter the left atrium Q6 From which chamber does the aorta arise Aorta arises from the left ventricle It is the largest artery in the body and it transports the oxygenated blood away from the heart Q7 a Where do the coronary arteries start b Use this knowledge to
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