Correlation Between The Atria And Ventricular Relaxation

There are two major cycles in the heart the systemic loop and the pulmonary loop. The systemic loop begins with oxygen rich blood coming from the lungs enters the upper left chamber of the heart. As the blood flows through the entire heart the blood then begins the journey through

Both the right and left atrium contract causing blood to flow though the two valves, and then into the left ventricle. The left ventricle pumps blood into the systemic circulation through the aorta. This systemic circulation system is much bigger than the pulmonary circulation system, which is why the left ventricle is so big. The blood on the left side of the heart is oxygenated. It becomes oxygenated when the deoxygenated blood passes through the right atrium and then flows into the left ventricle. It is then pumped along the pulmonary artery into the lungs where it is oxygenated. It then travels through the pulmonary veins back into the heart. It enters through the left atrium and then travels to the left ventricle. This process is repeated over and over again, to make blood continuously flow through the heart, lungs and body. This process ensures that there is always enough oxygen for the body to work

At the latter end of the p-q interval, atrial contraction occurs forcing additional blood into the ventricles. At the beginning of the QRS interval on an ECG reading, the mitral valve closes and the ventricles are at EDV (135ml). During the QRS interval, ventricular contraction occurs increasing the pressure in the ventricle and the aorta. When the pressure continues in the ventricle exceeds the pressure in the arteries, the aortic valve opens and blood is ejected. The increased pressure continues through the t peak. The ventricles are now in ESV (65ml) and the aortic valve is closed. Now the ventricles are relaxed causing pressure to fall and the cardiac cycle starts over again. This ECG reading was from a normal tracing. Keep in mind that an ECV is easy to obtain, but there are some subtleties that are very complex.

In a normal human being the heart correctly functions by the blood first entering through the right atrium from the superior and inferior vena cava. This blood flow continues through the right atrioventricular valve into the right ventricle. The right ventricle contracts forcing the pulmonary valve to open leading blood flow through the pulmonary valve and into the pulmonary trunk. Blood is then distributed from the right and left pulmonary arteries to the lungs, where carbon dioxide is unloaded and oxygen is loaded into the blood. The blood is returned from the lungs to the left

*Both sides of the heart are doing this at the same exact time and contracting/relaxing is what pumps the blood from one place to the other.

The atria and ventricles are separated by valves known as the AV valves. The purpose of these valves is to prevent blood from flowing in the wrong direction. Following the movement of blood from the atrium, into the ventricle, the AV valve snaps shut which causes the first heart sound of the heart beat. The beat is caused by the closing of two other valves.

The Q is the first wave downward, or negative, wave form of the QRS complex. The R wave is the first positive or upward, deflection. The R wave can occur with or without a Q wave. The T wave represents ventricular repolarization. The QT indicated the time from ventricular depolarization to repolarization. The wave of electricity it continues traveling through the myocardium to atrioventricular node. The AV node it coordinates the incoming electrical impulses from the atria and relays the impulse to the ventricles through a bundle of specialized muscle fibers. The atria pump blood into the ventricles and then the ventricles pump blood out of the heart. Chambers of the heart fill with blood during a relaxation phase diastole and eject blood during a contraction phase systole. Atrial

of atria and ventricle. Impulses not being transmitted from atria to the ventricle; no whole number relationship between atrial and ventricular contractions was demonstrated.

Moreover, atrial stimulation close to the AV BT insertion site results in maximal preexcitation. Failure of atrial stimulation to increase the amount of preexcitation can occur because of markedly enhanced AVN conduction, the presence of another AV BT, or pacing-induced block in the AV BT due to the long ERP of the BT (Kuo et al, 1996).

The cardiac cycle is the sequence of steps that are carried out when the heart beats. There are two main phases of the cardiac cycle; the diastolic phase and the systole phase. The diastole phase causes the heart to fill with blood and the systole phase moves the blood from the heart to the arteries. One cardiac cycle is completed when the heart fills with blood and then is pumped back out of the heart. The two main phases can be broken down into four steps.

The S-A node signal is delayed by the atrioventricular node to allow the full contraction of the atria that allows the ventricles to reach their maximum volume. A sweeping right to left wave of ventricular contraction then pumps blood into the pulmonary and systemic circulatory systems. The semilunar valves that separate the right ventricle from the pulmonary artery and the left ventricle from the aorta open shortly after the ventricles begin to contract. The opening of the semilunar valves ends a brief period of isometric (constant volume) ventricular contraction and initiates a period of rapid ventricular ejection.

Another problem surgeons faces is the connecting of the circulatory system of the heart. The coordination of atrial and ventricular contractions is necessary for efficient pumping of the blood. Any damage leads to a loss of coordination and diminished heart function. But how do surgeons and doctors come to make sure the circulatory is system is working at its best is by using an electrocardiogram, or ECG. With this procedure, electrodes are placed on key points of the body's surface to monitor the electrical activity of the heart. However, what happens if the low flowing of blood or blockage of the blood comes to happen. Myocardial infarctions, or heart attacks happens, and it its due to the blockage or reduction of blood flow to an area of

The right atria inter-nodal tracks and Bachmann's bundle conduct the SA-nodal activation throughout the atria initiating a coordinated contraction of the atria walls. Meanwhile, the impulse reaches the AV-node, which is the only electrical connection between atria and ventricles. The AV-node introduces an effective delay, allowing the contraction of the atria to complete before ventricular contraction is initiated.

6) When the left ventricle is full it contracts, and blood is pushed out into the

Heart Contractions and Blood Flow – An animation of the showing how the heart pumps.