Which of the following is the correct sequence of blood flow in birds and mammals? a. pulmonary vein → left atrium → left ventricle → pulmonary circuit b. vena cava → right atrium → right ventricle → pulmonary vein c. vena cava → right atrium → right ventricle → pulmonary artery d. left ventricle → aorta → lungs → systemic circulation

The correct sequence of the blood circulation in the birds and mammals is  c. vena cava → right atrium → right ventricle --> pulmonary artery, among the given options.

Mammals and birds both have a four-chambered heart which is very efficient that makes two circuits of blood circulation for oxygenated through the body and deoxygenated blood to the lungs separately.

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