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Sistema circulatorio y sus partes yahoo dating, importancia del sistema circulatorio?

Importancia del sistema circulatorio?

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The base is the widest part, superior to the apex the pointed tip. The semilunar valves are forced open and remain open until the ventricles relax. The greater pressure generated requires the papillary muscles to be larger and the chordae tendineae thicker and stronger to anchor the mitral valve. Anatomy of the Heart The heart is located in the thoracic cavity within the mediastinum, a serous membrane sac between the lungs.

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Because the left ventricle has to pump against greater pressure the walls mycardium are much thicker than the walls of the right ventricle. This usually happens to valves on the left side of the heart mitral and or aortic semilunar because of the greater pressure generated by the left ventricle. The coronary sinus empties into the right atrium. Atria are separated from each other by the interatrial septum, the ventricles are separated by the interventricular septum. Rheumatic fever streptococcal infection can cause faulty valves, cosiata yahoo dating especially the mitral valve.

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The tricuspid valve three cusps, or flaps prevents backflow of blood into the atrium when the ventricle contracts. Valvular defects can be congenital from birth or acquired.

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Points toward right shoulder, deep to the second rib Apex points to left hip, rests on the diaphragm, at the level of the fifth intercostal space. Epicardium - the visceral pericardium The pericardial cavity is filled with pericardial serous fluid, the outer layer is the parietal pericardium, which is fused to the fibrous pericardium. Ventricles receive blood from the atria and pump blood out to vessels carrying blood away from the heart. Coronary Circulation The mycardium is served by its own circulation. Myocardium - thickest layer, consists of cardiac myocytes muscle which contract to cause the heart to beat.

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As the ventricles relax the backflow of blood in the pulmonary trunk and aorta snap the semilunar valves shut. The right and left coronary arteries branch, branches run into capillary beds in the wall, capillaries coalesce into coronary veins, which join to form the coronary sinus. Papillary muscles in the wall of the ventricle are attached to fibrous cords called chordae tendineae, which are attached at their other end to the cusps of the tricuspid valve.

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