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Question
Give reason for the following:
Only the veins and not the arteries are provided with valves.
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Solution
Veins carry the blood from the body part towards the heart while the arteries carry the blood
from the heart. Veins carry the blood against the force of gravity. Therefore, only the veins
and not the arteries are provided with valves.
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| 2. | Carbon Dioxide | ______ | ______ |
| 3. | Urea | ______ | ______ |
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