Heart :: essays research papers

PRACTICAL EXERCISE 4 tenderness STRUCTURE AND CIRCULATIONQ.1 Describe the boldness sounds you hear. Explain the origin of two sounds.deuce heart sounds are normally heard through a stethoscope on the chest wall, "lab" "dap". The first sound can be expound as soft, but resonant, and longer then the second one. This sound is associated with the occlusive 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 amongst the each set of sounds. It is a period of total heat slackening called quiescent period.Q.2 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 cognize as "heart murmurs" are sometimes a sign of heart disease. "Murmurs can be produced by stock flowing rapidly in the usual directions through an abnormally narrowed valve" (Vander, Sherman and Luciano, 1985, p.326) and in some cases, as mitral valve prolapse, the individual does not show any symptoms.Q.5 If a shabu probe is poked into the pulmonary trunk which chamber will it stick in?The ice-skating rink 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.Q.6 From which chamber does the aorta arise?Aorta arises from the left ventricle. It is the largest artery in the carcass and it transports the oxygenated blood away from the heart.Q.7 (a) Where do the coronary thrombosis arteries start?(b) Use this knowledge to explain how the coronary arteries only fill with blood during diastol e.The heart, like separate organs, receives its blood supply through the little vessels of arterial branches. In this case, coronary arteries, which starts from the base of ascending aorta.The blood circulates through coronary arteries and then to smaller vessels into cardiac muscle (myocardium). The blood flow is influenced by aortic pressure, which increases in systole, and the pumping activity of the ventricles. When the ventricle contracts, in systole, the coronary vessels are compressed by the contracted myocardium and partly blocked by the open aortic valve whence the blood flow through the myocardium stops.