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The right atrium contracts, and blood passes to the right ventricle.The right atrium receives deoxygenated blood from the body through veins called the superior and inferior vena cava.The right side of the heart receives deoxygenated blood and sends it to the lungs. The atria and ventricles contract and relax in turn, producing a rhythmic heartbeat. The left and right sides of the heart work in unison. Learn more information about a “normal” heart rate here. But this can increase to 100 beats per minute (bpm) or more. The rate at which the heart contracts depends on many factors, such as:Īt rest, the heart might beat around 60 times each minute.