The sequence of blood flow can be observed in either a reptile or mammal is vena cava - right atrium - ventricle - pulmonary circuit. The correct option is 5.
Pulmonary circulation transmits oxygen-depleted blood from the right ventricle to the lungs, where it replenishes with new blood. The oxygen-rich blood is then returned to the left atrium.
Its order is first blood from vena cava goes into right atrium, from there it goes to ventricle, and from ventricle it travels through pulmonary circuit.
Thus, the correct option is 5.
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