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