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प्रश्न
Why do arteries have thick and elastic walls whereas veins have valves?
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उत्तर
The blood emerges from the heart under high pressure and flows through arteries. Hence, to bear this pressure the arteries have thick and elastic walls. Veins have valves to ensure that the blood flows in one direction only.
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संबंधित प्रश्न
Sketch and label the T.S. of vein.
Name largest vein, in our body.
What are the upper parts of the heart called?
Put a tick mark (✓) against the correct alternative in the following statement:
Nucleus is absent in
- RBCs
- WBCs
- All blood cells
- Liver cells.
Name the Following
The blood vessel that begins and ends in capillaries.
Long answer question:
Which blood vessel of the heart will have the maximum content of oxygen and why?
Identify the CORRECT statement about veins.
From where to where do the following blood vessel carry blood?
Pulmonary artery
From where to where do the following blood vessel carry blood?
Renal artery
