Double Circulation: Pulmonary & Systemic — NEET Biology
📚 Practice ConceptWe have a complete double circulation, i.e., two circulatory pathways, namely, pulmonary and systemic are present. The pulmonary circulation starts by the pumping of deoxygenated blood by the right ventricle which is carried to the lungs where it is oxygenated and returned to the left atrium. The systemic circulation starts with the pumping of oxygenated blood by the left ventricle to the aorta which is carried to all the body tissues and the deoxygenated blood from there is collected by the veins and returned to the right atrium. Though the heart is autoexcitable, its functions can be moderated by neural and hormonal mechanisms.
Arrange the following structures in the correct sequence for double circulation and assign 1 = deoxygenated, 2 = oxygenated next to each: Structures: A. Left Ventricle B. Pulmonary Veins C. Right Atrium D. Aorta E. Lungs F. Right Ventricle G. Left Atrium H. Pulmonary Artery
View solution & NCERT explanation
Correct answer: C — C(1) → F(1) → H(1) → E → B(2) → G(2) → A(2) → D(2)
Right Atrium (C, 1): Deoxygenated blood from the body enters the right atrium through the venae cavae. Right Ventricle (F, 1): From the right atrium, blood moves to the right ventricle, still deoxygenated. Pulmonary Artery (H, 1): Right ventricle pumps deoxygenated blood into the pulmonary artery. Lungs (E): Gas exchange occurs; blood becomes oxygenated. Pulmonary Veins (B, 2): Oxygenated blood returns to the left atrium via pulmonary veins. Left Atrium (G, 2): Receives oxygenated blood from lungs. Left Ventricle (A, 2): Pumps oxygenated blood with strong force. Aorta (D, 2): Distributes oxygenated blood throughout the body. Thus, pulmonary circulation (RA → RV → Pulmonary artery → Lungs → Pulmonary veins → LA) is followed by systemic circulation (LV → Aorta → Body → Venae cavae → RA).
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Through deep analysis of NEET and NTA, 176 of the 180 ReNEET 2026 (June 21) questions were already in the MedicNEET question bank before the exam.
176/180MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.