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प्रश्न
Long answer question:
How blood is kept moving in the large veins of the legs?
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उत्तर
1. The blood in the large veins of legs is kept moving by the means of azygos system (located on either side of the vertebral column and drains the viscera within the mediastinum, as well as the back and thoracoabdominal walls).
2. It serves as a bypass for the inferior vena cava that drains blood from the lower body.
3. Several small veins link the azygos system directly with inferior vena cava. Large veins drain the lower limbs and abdomen, conducts blood into the azygos system.
4. If the inferior vena cava or hepatic portal vein becomes obstructed, the azygos system returns blood from the lower body to the superior vena cava.
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संबंधित प्रश्न
Sketch and label the T.S. of vein.
Put a tick mark (✓) against the correct alternative in the following statement:
Blood Capillary is a
- Broad tube
- Artery with thick wall
- Vein with large lumen
- Narrow tube made up of endothelium only.
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The blood tastes saltish due to the presence of dissolved:
- Sodium chloride
- Potassium chloride
- Ammonium nitrate
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Vena cava and aorta.
Differentiate between the following pair of terms:
Platelets and WBC.
What is blood pressure? When does it rise?
The diagram below represents a certain category of blood vessels showing the role of a special structure in their walls :
(i) Name the kind of blood vessels shown.
(ii) What is the structure shown inside the blood vessels?
(iii) What is the role of these structures?
(iv) Are these structures present in any other kind of blood vessel? If so, name it.
(v) Towards which side of the figure (Top or Bottom) is the heart located?
Complete the following sentence with appropriate words:
The three distinct types of blood vessels are _____, ______, and _________.
Why is the velocity of blood flow the lowest in the capillaries?
With the help of neat and labelled diagrams artery and vein.
