NEET 2013 · Class 11

Body Fluids and Circulation

[DIAGRAM: Human double circulation showing the four heart chambers right atrium (RA), right ventricle (RV), left atrium (LA), and left ventricle (LV), pulmonary and systemic circuits, and cross-sections of blood vessels labeled A, B, C with D indicating a vessel in the pulmonary circuit.] 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

Verbatim line

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
Page
8
Words matched
29 of 29

The answer appears as a continuous sentence in NCERT. This is that sentence.

How this line gives the answer

0, emb=0.9076, combined=0.9446). Verified: high — The span explicitly states that pulmonary veins carry oxygenated blood to the left atrium, which directly matches option C's identification of D as the pulmonary vein and its function of taking oxygenated blood to the heart.

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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.