STANDARDZoology-Human Physiology
STANDARD Zoology Circulatory System MCQ Question
Type: MCQ-conceptual-Medium
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.
A
B - Capillary - thin without muscle layers and well two celled thick
B
C - Vein - thin walled and blood flows in jerks/spurts
C
D - Pulmonary vein - takes oxygenated blood to heart PO₂ = 95 mm Hg
D
A - Artery - thick walled and blood flows evenly
Correct Answer
Option C
Detailed Explanation
The pulmonary vein carries oxygenated blood from the lungs to the left atrium of the heart, which is indicated by the label D in the diagram. This matches option 3.
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