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HEART Prepared by – Swati Priyadarsini Parija Class – x Balichandrapur high School The Central Processing Unit of Human Body Cardia(Greek term) means Heart. Cor(Latin term) means Heart It is the restless organ of the body. It is the functional unit of circulatory system. It is the hollow, conical and muscular central pumping organ maintains circulation of blood in body. Heart is present in oblique manner in mediastinum(mid part of thorasic Cavity) in between to the lungs . Its length is 12 c.m and breath is 9c.m.Human heart is a 4 chambered upper 2 are called ventricles are larger than auricles. Function of Heart 1. The rhythmic contraction and relaxation of central pumping organ heart helps in circulation of blood to tissue and to heart. 2.Contraction of heart chambers is called systole and relaxation is called diastole. 3.Deoxygented by blood through superior and inferion venacava and coronary sinus enters to right auricle . 4.Oxygenated blood through pulmonary veins enter the left auricle .