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.

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B - Capillary-Thin without muscle layer and wall two cell layers thick

C - Vein-Thin walled and blood flows in jerks/spurts

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

A - Artery-Thick walled and blood flows evenly

answer is C.

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Detailed Solution

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