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Drag and drop to complete the human respiratory tract:
Answer variants:
Bicuspid and tricuspid valves open
Blood flows into ventricles
Relaxation of atria where atria fill blood from the vena cava
Relaxation of ventricles, semilunar valves close
Bicuspid and tricuspid valve closes immediately - first heart sound
Ventricles contract due to stimulation by SA node
Semilunar valves open
Stimulation by SA node
Auricles contract
After the ventricle contraction, blood flows into pulmonary trunk and aorta
Bicuspid and tricuspid valves open causing flow of blood flow from the atria into the ventricles
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