Veins are blood vessels with lesser elasticity, carries blood to the heart.In a man all veins are replaced with plastic tubes of same elasticity what will happen :1)there will be no effect.2)swelling will occur at his legs hands.3)Blood carrying rate will be increased slightly then veins4)tubes will burst.
The correct option is (d).
It is because veins are made of elastic connective tissue. Blood flows in veins under pressure. The connective tissue expand or contract according to the blood pressure. Moreover veins have valves to prevent backward flow of blood. In contrast, plastic vessels cannot expand or contract according to the blood pressure and hence will burst.
It is because veins are made of elastic connective tissue. Blood flows in veins under pressure. The connective tissue expand or contract according to the blood pressure. Moreover veins have valves to prevent backward flow of blood. In contrast, plastic vessels cannot expand or contract according to the blood pressure and hence will burst.