Valves located at the exit route of the ventriclesThe larger chambers of the heart (3 times the volume and muscle thickness than the atria), responsible for the pumping of blood to the lungs and the rest of the body.; for the right ventricleThe right ventricle ejects blood through the main branches of the left and right pulmonary arteries to the lungs. The chambers of the heart are the main drivers within an intricate pathway, delivering blood to the lungs for gas exchange..., connects with the pulmonary arteryMain vessels carrying blood from the heart; the arteries have minimal elasticity and contain approximately 20% of the blood supply. Major Vessels 1. Six Second ECG Guidebook (2012), T Barill, p. 15, 190; for the left ventricleThe left ventricle ejects blood into the aortic arch to the body. Within the arch, the coronary arteries branch off first followed by three main arteries that branch to the brain (carotids) and the upper thorax (subclavian artery). The chambers..., connects with the aortaBegins with the aortic valve, the largest main vessel that carries oxygenated blood from the ventricles to the body. Major Vessels 1. Six Second ECG Guidebook (2012), T Barill, p. 15, 190.
The atriaRight and left atria (1/3 volume and muscle mass of the ventricles) pump blood to the ventricles. Chambers and Layers of the Heart 1. Six Second ECG Guidebook (2012), T Barill, p. 190 and ventricles are separated by the tricuspid valve (3 leaf) in the right heart and the bicuspid or mitral valve (2 leaf) in the left heart. Blood ejected from the ventricles pass through the semilunar valves (see Figure 1.3), the pulmonic valve into the pulmonary arteries and the aortic valve into the aorta. Pressure within a ventricle or artery catches the cusps of a valve – like a parachute – closing the valve and preventing back flow.
The closure of the AV valves (tricuspid and mitral valves) normally produces the S1 heart sound. The closure of the semilunar valves (pulmonic and aortic valves) produces the S2 heart sound.
The aortic and pulmonic semilunar valves are pictured in Figure 1.3. The leaves of the semilunar valves are billowed closed during ventricular diastoleThe phase of relaxation during the cardiac cycle; occurs for the atria and the ventricles; blood enters the heart’s chambers and the coronary arteries during diastole; note that diastole is as important as systole – the negative pressure created by... as arterial pressure becomes greater than the pressure within the ventricles. The semilunar valves ensure forward flow of the arterial blood ejected from the ventricles.
Figure 1.4 depicts the valves of the heartValves act as gates ensuring unidirectional blood flow. They are located between the atria and ventricles as well as between the ventricles and the major arteries. The atrioventricular (AV) valves lie between the atria and the ventricles of the right... from above the heart.
1. Six Second ECG GuidebookA Practice Guide to Basic and 12 Lead ECG Interpretation, written by Tracy Barill, 2012 Introduction The ability to correctly interpret an electrocardiogram (ECG), be it a simple six second strip or a 12 lead ECG, is a vital skill... (2012), T Barill, p. 12-13, 23, 205