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प्रश्न
Give reason for the following:
Only the veins and not the arteries are provided with valves.
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उत्तर
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.
संबंधित प्रश्न
Describe the function of the heart.
The vein that carries oxygenated blood.
With which human organ system (or human systems) is vena cava associated?
Why is it necessary to know the blood groups before giving transfusion?
Name the following:
The artery which carries deoxygenated blood.
A blood vessel which has small lumen and thick wall is ______.
Find out my partner.
| Group 'A' | Group 'B' |
| 1. Heart beats | a. 350 ml |
| 2. RBC | b. 7.4 |
| 3. WBC | c. 37∘C |
| 4. Blood donation | d. 72 |
| 5. Normal body Temperature | e. 50-60 lakh/mm3 |
| 6. pH of oxygenated blood | f. 5000-6000 per mm3 |
Explain the following:
Why is the closed circulatory system more efficient than the open system?
Blood consists of two parts - a liquid part and a cellular part. Name these parts and briefly write about them
Long answer question:
Describe human blood and give its functions.
