Name the structures that are present in veins and lymph ducts but absent in arteries.

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Solution

The structures that are present in the veins and lymph ducts are VALVES. These are absent in arteries. They are one-way valves. If the blood moves in the opposite direction, the valves close and avoid the backward flow of blood in veins and lymph ducts.

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Complete the following statements by filling in the blanks from the choices given in the bracket.
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(b) A blood vessel which has a small lumen and thick walls is (capillary, lymphatic duct, artery, venule)
(c) the valve which prevents backflow of blood in the veins and lymph vessels... (mitral valve, tricuspid valve, semilunar valve).

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