closure of the mitral and tricuspid valves.
The second sound of the cardiac cycle, commonly referred to as the S2 sound, occurs when the aortic and pulmonary valves close at the end of ventricular systole as blood is forced out of the ventricles and into the aorta and pulmonary artery. This sound marks the end of the systole phase and the beginning of diastole.
when the ventricles closes and between the atria and the ventricles.
The "lub-dub" sound of the heartbeat is produced by the closing of the heart valves. The "lub" (first heart sound) occurs when the atrioventricular valves close as the ventricles contract, while the "dub" (second heart sound) happens when the semilunar valves close as the ventricles relax. This cyclical opening and closing of the valves during the cardiac cycle generates the characteristic sounds associated with a heartbeat.
Diastole is the phase in the cardiac cycle that allows filling of blood into the ventricle. It corresponds to the lower number in the blood pressure measurement. A normal upper limit of the blood pressure falls in the range less than 120/80 mm Hg. Above this value, it is considered pre-hypertension based on The Seventh Report of the Joint National Committee on Prevention, Detection, Evaluation, and Treatment of High Blood Pressure.During the diastolic period the ventricle is in the fifth phase of the cardiac cycle. This phase is termed isovolumetric relaxation which occurs immediately after the second heart sound. In this phase, all valves of the heart are closed. The volume of blood in the ventricle during this phase of the cardiac cycle remains constant. Following the fifth phase of the cardiac cycle is the rapid filling of blood into the ventricle. This cycle corresponds to the opening of the mitral and tricuspid valves located between the left and right atria and ventricle, respectively. The next phase of the cardiac cycle, called diastasis, is the longest phase of the cardiac cycle. In this cycle, the ventricle continues to fill with blood but at a much slower rate. The final phase of diastole corresponds to the first phase of the cardiac cycle. In this phase of the cardiac cycle, the atria contracts to provide additional filling of blood into the ventricle. After the final phase of diastole, the systolic phase of the cardiac cycle begins.
The "lub-dub" sounds of the heart, heard with a stethoscope, are caused by the closure of the heart valves. The "lub" (first sound) occurs when the atrioventricular valves (mitral and tricuspid) close during ventricular contraction (systole). The "dub" (second sound) happens when the semilunar valves (aortic and pulmonary) close at the end of ventricular contraction (diastole). These sounds reflect the rhythmic pumping action of the heart and the movement of blood through the cardiac cycle.
The "lub" sound of our heartbeat, known as the first heart sound (S1), is primarily caused by the closure of the atrioventricular (AV) valves—the mitral and tricuspid valves—during ventricular contraction (systole). When the ventricles contract, blood is pumped out of the heart, and the sudden closure of these valves creates a distinct sound. This sound is essential for indicating that the heart is properly pumping blood and is part of the normal cardiac cycle.
The difference between lub and dub (The heart sounds S1 and S2 of a heartbeat) is that the lub occurs when atrioventricular valves close, and dub occurs when the aortic and pulmonary valves close (valves leading out of the heart from the left and right ventricles).
Heart sounds, specifically the "lub" (S1) and "dub" (S2), correlate with specific phases of the cardiac cycle as reflected in ECG readings. The S1 sound occurs with the closure of the atrioventricular valves, coinciding with the QRS complex, which represents ventricular depolarization. The S2 sound occurs with the closure of the semilunar valves, aligning with the end of the T wave, which represents ventricular repolarization. Thus, heart sounds provide auditory confirmation of the mechanical events depicted in the ECG.
poop is generated
The Y in cycle is a long I vowel sound, as the E is silent.
Really? Cause light travels faster than sound.
There is indeed a schwa sound in the word 'open'. [ˈəʊ.pən]