NURS 3000H Lecture Notes - Lecture 4: Median Sternotomy, Peripheral Edema, Anatomical Terms Of Motion
Document Summary
Blood supply to the myocardium: own supply, coronary circulation in 90% of people, the av node and bundle of his supply blood to the right coronary artery obstruction often leads to serious defects. A specialized nerve system that is responsible for creating and transporting the electrical impulse or action potential. The impulse initiates depolarization leading to cardiac contraction. The impulse is instated by the sa (sinoatrial) node (pacemaker of the heart) The impulse then travels from the atria to the av (atrioventricular) node. Then through the bundle of his and the left and right bundle branches. Action potential diffuses widely through the walls of both ventricles by the purkinje fibres. Chemoreceptors: aortic arch and carotid body, respond to changes in o2, co2 and plasma ph, stimulate vasomotor centre to change cardiac activity accordingly. Blood pressure: svr: force opposing the movement of blood, created by small arteries and arterioles, ***discusses how to take bp (pg.