NEET 2013 · Class 11

Body Fluids and Circulation

[DIAGRAM: A schematic of human double blood circulation showing the heart with right atrium, right ventricle, left atrium and left ventricle, systemic and pulmonary circulation, and labels A to D marking major blood vessels and a capillary bed.] The figure shows blood circulation in humans with labels A to D. Select the option which gives correct identification of label and functions of the part.

  1. (A)B - Capillary - Thin without muscle layer and wall two cell layers thick
  2. (B)C - Vein - Thin walled and blood flows in jerks/spurts
  3. (C)D - Pulmonary vein - Takes oxygenated blood to heart, pO2 = 95 mmHg
  4. (D)A - Artery - Thick walled and blood flows evenly

The NCERT line that answers it

Concept-grounded

The deoxygenated blood pumped into the pulmonary artery is passed on to the lungs from where the oxygenated blood is carried by the pulmonary veins into the left atrium.

Chapter
Body Fluids and Circulation
Section
15.4 DOUBLE CIRCULATION

The answer is taught in this NCERT section but is not one quotable sentence. It needs combining facts or applying the idea.

How this line gives the answer

Claim discrepancy: claimed D, GPT says C. Matched with override at hybrid rank 1.

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Question text is reproduced from the published NEET 2013 paper for study and commentary. NCERT text is quoted, not redistributed; textbooks remain at ncert.nic.in. Our mapping method, including its measured error rates, is published at /methodology.