pulmonary artery differs from pulmonary veins in having
(a)Thick Wall
(b)thin wall
(c)valves
(d)both 2 & 3
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Answer:
( D) Both 2 and 3
Explanation:
The blood in the pulmonary artery is under less pressure since it is only being pumped a short distance to the lungs and so does not need a thick wall. Valves are used to prevent backflow of blood.
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