PPT-Heart Actions Cardiac Cycle

One complete heartbeat The contraction of a heart chamber is called systole the relaxation of a chamber is called diastole During ventricular systole the aortic valve . Refers to the events of 1 complete heart beat . Both atria & ventricles contract then relax (0.8 sec if beating 75x/min). Key terms to know. Diastole. - relaxation. Systole. - contraction. Lub-dub. Circuits of the Blood. There are 3 circuits:. Systemic Circulation. From the left ventricle to the aorta and on to the body. Back to the heart via the superior and inferior vena cava to the right atrium. The Pericardium – . membrane surrounding heart. Serous Pericardium . = 1. Parietal - outer layer. 2. Visceral - inner layer (part of . epicardium. ). Layers of Heart Wall. Epicardium. – outermost layer. Heart Wall. Three layers. Epicardium. Outside layer. AKA visceral pericardium. Pericardium. Visceral pericardium or epicardium. Next to heart. Actually part of heart wall. Parietal pericardium. Outside layer. Location. Superior surface of diaphragm. Left of the midline. Anterior to the vertebral column, posterior to the sternum. Heart Anatomy. Coverings of the Heart: Anatomy. Pericardium – a double-walled sac around the heart composed of:. *. Systole = . *. Diastole = . *. BP = . 1. 2a. 2b. 3. Atrioventricular valves. Aortic and pulmonary valves. Open. Open. Closed. Closed. Closed. Open. Phase. Left atrium. Right. atrium. Left. ventricle. . Systole = . Diastole = . BP = . 1. 2a. 2b. 3. Atrioventricular valves. Aortic and pulmonary valves. Open. Open. Closed. Closed. Closed. Open. Phase. Left atrium. Right. atrium. Left. ventricle. Right. The Electrocardiogram. . The conduction of APs through the heart generates electrical currents that can be read through the skin. AP = Action Potential. Currents picked up by electrodes. The recording is called an . Learning Objectives. Explain how the heart works in relation to the conduction system . Explain the cardiac cycle. Explain how the two systems are linked . How does the heart contract.......?. Heart is composed of cardiac muscle. Understandings. U.D.4.1: structure of cardiac muscle cells allows propagation of stimuli through the heart wall. . U.D.4.2: signals from the sinoatrial node that cause contraction cannot pass directly from atria to ventricles.. The cardiac cycle and coronary flow. Conduction System. https://. www.youtube.com/watch?v=A2YoGyNhAns. Coronary flow. https://. www.youtube.com/watch?v=tBQa8IBzP6I. Summary. The conduction system of the heart is composed . Cardiac Arrest. A cardiac arrest occurs when the heart stops beating and breathing stops. Heart Attack. A heart attack occurs when an artery supplying blood to your heart becomes completely blocked. A patient might complain of chest pain and the heart continues to beat. Diastole. DHO 7.8, . pg. . 185. The R & L side of the heart work together. The heart is 2 pumps.. Systole. =period of ventricular . contraction. Diastole. =period of ventricular rest (when ventricles aren’t contracting). . . failure of the heart to pump blood adequately. Cardiac failure is manifested by two ways---. 1) . C.O.. 2) . C.O.. . . .