the contraction time of atria and ventricles are same or different ?
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different ! the atria contraction happens before the contraction of ventricles
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During a single cardiac cycle, the atria and ventricles do not beat simultaneously; the atrial contraction occurs prior to ventricular contraction. This timing delay allows for proper filling of all four chambers of the heart.
In the first stage the Right and Left Atria contract at the same time, pumping blood to the Right and Left Ventricles. Then the Ventricles contract together (called systole) to propel blood out of the heart. After this second stage, the heart muscle relaxes (called diastole) before the next heartbeat.
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