Circulatory System Structure Location Function 1) Heart Situated between the two Pumps oxygenated blood to the in the thoracic cavity. The different parts of the body. apex is tilted towards the left side. 2) Pericardial fluid Found in the pericardial Protects the heart from cavity, between the two mechanical injury and shock. membranes of pericardium. Acts as a lubricant and reduces friction for the beating of the heart. Keeps the tissues of the heart moist. 3) Sino atrial node Upper wall of right atrium. Initiates the heart beat. (S A node) or Regulates the contraction of the Pacemaker. auricles. 4) Atrio Ventricular Bottom of the auricle. Regulates the contraction of the node. (AV node) ventricles. 5) Bundle of His Arises from the A V node and It receives an impulse from the A V consists of a left and right node and transmits it to the Purkinje branch which extends upto fibres. the apex of the heart. 6) Bicuspid valve or Between the left auricle and Allows the blood to flow from the left mitral valve. ventricle of the heart. auricle to the left ventricle and prevents it from going back into the auricle. 7) Tricuspid valve. Between the auricle and Allows the blood to flow from the ventricle of the heart. right auricle to the right ventricle and prevents it from going back into the auricle. 8) Chordae Extend from the papillary Keeps the tricuspid and bicuspid tendinae. muscles to the pointed ends valves in position and prevents them of the cuspid valves. from upturning. 9) Pulmonary At the opening of the Prevents backflow of deoxygenated semilunar valve. pulmonary artery which blood into the right ventricle. arises from the right ventricle. 10) Aortic At the opening of the aorta Prevents backflow of oxygenated semilunar which arises from the left into the left ventricle. ventricle. 11) Coronary artery Arises from the aortic arch, Supply oxygenated to the walls near its base as it emerges of the heart. from the heart.
Circulatory System Structure Location Function 1) Heart Situated between the two in the thoracic cavity. The apex is tilted towards the left side. Pumps oxygenated blood to the different parts of the body. 2) Pericardial fluid Found in the pericardial cavity, between the two membranes of pericardium. Protects the heart from mechanical injury and shock. Acts as a lubricant and reduces friction for the beating of the heart. Keeps the tissues of the heart moist. 3) Sino atrial node (S A node) or Pacemaker. Upper wall of right atrium. Initiates the heart beat. Regulates the contraction of the auricles. 4) Atrio Ventricular node. (AV node) Bottom of the auricle. Regulates the contraction of the ventricles. 5) Bundle of His Arises from the A V node and consists of a left and right branch which extends upto the apex of the heart. It receives an impulse from the A V node and transmits it to the Purkinje fibres. 6) Bicuspid valve or mitral valve. Between the left auricle and ventricle of the heart. Allows the blood to flow from the left auricle to the left ventricle and prevents it from going back into the auricle. 7) Tricuspid valve. Between the auricle and ventricle of the heart. Allows the blood to flow from the right auricle to the right ventricle and prevents it from going back into the auricle. 8) Chordae tendinae. Extend from the papillary muscles to the pointed ends of the cuspid valves. Keeps the tricuspid and bicuspid valves in position and prevents them from upturning. 9) Pulmonary semilunar valve. At the opening of the pulmonary artery which arises from the right ventricle. Prevents backflow of deoxygenated blood into the right ventricle. 10) Aortic semilunar At the opening of the aorta which arises from the left ventricle. Prevents backflow of oxygenated into the left ventricle. 11) Coronary artery Arises from the aortic arch, near its base as it emerges from the heart. Supply oxygenated to the walls of the heart.
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