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प्रश्न
Why are capillaries thin walled?
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उत्तर
The capillaries are thin walled, because they help in the exchange of gases and diffusion of materials into the cells. This diffusion is possible due to the thinness of its walls.
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संबंधित प्रश्न
A blood vessel which carries blood back to the heart is:
Put a tick mark (✓) against the correct alternative in the following statement:
Function of WBCs is to
- Transport oxygen
- Help in clotting of blood
- Provide immunity
- Provide storage of food.
Put a tick mark (✓) against the correct alternative in the following statement:
The blood tastes saltish due to the presence of dissolved:
- Sodium chloride
- Potassium chloride
- Ammonium nitrate
- Sodium nitrate
State briefly, the difference between white blood cells and the red blood cells.
Answer very briefly, Why is it necessary to know The blood groups of the donor as well as the recipient ?
Multiple choice question. Tick (✓) the correct choice:
The four blood groups in humans are
- A, B, C and D
- A, B, AB and C
- A, B, AB and O
- A, B, AB and OO
What is antigens?
The blood vessel that supplies oxygenated blood to the liver.
Assertion: Veins have thin walls to collect blood from different organs.
Reason: Blood in veins are not under pressure.
______ carry blood to an organ and break up into ______ ending in capillaries.
