Topic: red light therapy frequency

Throughout ventricular systole, pressure rises within the left ventricle and when it is greater than the stress within the aorta, the aortic valve opens, permitting blood to exit the left ventricle into the aorta. When ventricular systole ends, pressure in the left ventricle rapidly drops and the stress within the aorta forces the aortic valve to close. The closure of the aortic valve contributes the A2 component of the second heart sound. The pulmonary valve (typically referred to because the p...