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प्रश्न
Veins have valves that allow blood to flow only in one direction. Arteries do not have valves. Yet the blood flows in one direction only. Can you explain why?
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उत्तर
Blood flow in arteries is rapid as the blood in them is under great pressure. Thick elastic walls of arteries are not collapsible and maintain one direction rapid flow.
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संबंधित प्रश्न
Name the following:
Components of blood
Mature RBC in mammals does not have cell organelles.
Direction: In each of the following questions a statement of assertion (A) is given and a corresponding statement of Reason (R) is given just below it. Mark the correct statement as.
Assertion: RBC plays an important role in the transport of respiratory gases.
Reason: RBC does not have cell organelles and a nucleus.
The volume of blood in human adults is ______.
The ______ brings blood containing oxygen and urea from the aorta to the kidneys.
What is the special feature present in a human heart which does not allow mixing of blood when oxygen-rich and carbon dioxide-rich blood reach the heart?
Why is it called an artery if it does not carry oxygen-rich blood?
Paheli noticed water being pulled up by a motor pump to an overhead tank of a five-storeyed building. She wondered how water moves up to great heights in the tall trees standing next to the building. Can you tell me why?
When a red blood corpuscle containing both A and B antigens are mixed with your blood serum, they agglutinate. Hence your blood group is ______.
Least abundant leucocyte is ______.
