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Double Circulation

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.


D - Pulmonary Vein-Takes oxygenated blood to heart, PO2 = 95 mmHg

C - Vein-Thin walled and blood flows evenly.

B - Capillary-Thin without muscle layer and wall one cell layer thick (squamous epithelium).

A - Artery-Thick walled and blood flows in jerks.

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