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above.1. is what happens when depolarization of the atria cause the atria to go into atrial systole. Atrial pressure increases and more blood is forced into the ventricles via the AV valves.2. is the continued contraction of the ventricles that leads to the pressure inside the ventricles to build up and will thusforce open the semilunar valves and blood will be ejected out of the heart to the pulmonary and systemic circuits.3. is the process that begins when both the atria and the ventricles are in diastole. Blood from the veins are returning to the heart and the pressure within the atria is higher than the ventricular pressure. Causing the AV valves to open and blood will passively fill into the ventricles. It is important to know that the semilunar valves are closed shut because they have higher pressure than both the left and right ventricle.
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above.1. is what happens when depolarization of the atria cause the atria to go into atrial systole...
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