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Solution


Q.

Pulmonary artery differs from pulmonary vein in having
 a) No endothelium     b) Strong valves     c) Branner’s cells       d) Thick muscular walls
1 A
2 B
3 C
4 D

Ans.

(d) Pulmonary artery differs from pulmonary vein in having thick muscular wall. The veins have internal semilunar valve to prevent backflow of blood.