Explain the function of the human heart

Describe where the human heart is located - i.e. thoracic cavityDefine the function of the heart - to supply the body with blood, act as a pumpStructure of the heart - 4 chambers (2 ventricles, 2 atria), SAN, AVN, valves, vessels coming in and travelling outDescribe the pulmonary circulation and then the systemic circulationDescribe the electrical conduction of impulses through the heart muscle to achieve contractility