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प्रश्न
Which one of the following does not have valves?
पर्याय
Heart
Arteries
Capillaries
Veins
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उत्तर
Arteries
Veins carry deoxygenated blood (except pulmonary vein) from various parts of the body to the heart. The blood in veins flows with less pressure. Therefore, veins have valves to prevent the backflow of blood. The arteries carry blood from the heart to the other body parts. The blood in arteries flow at high pressure and so the blood flows only in one direction. So, arteries do not require valves as the chances of backflow are less. The heart has valves between the atria and ventricles. They prevent the backflow of blood from the ventricles to the atria.
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संबंधित प्रश्न
Write the function of valves present in between atria and ventricles.
What is the name of blood vessels which connect arteries to veins?
What is the role of haemoglobin in the blood ?
During surgical operations or during accidents, the patient may be given blood from outside to save his life. What is the technical name of this process ? Briefly explain the precautions to be observed and taken in this process.
Fill in the blank:
The blood vessels which carry blood from the heart to different parts of the body are called ________.
Fill in the blank.
The red-coloured pigment present in RBCs is called __________.
Describe the function of Blood vessels.
Name the following:
Components of blood
What are seen as greenish blue lines in our hands and legs?
What is antigens?
The figures given below show diagrammatic cross sections of three kinds of blood vessels.
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- Identify the blood vessels A, B and C.
- Name the parts labelled 1-4.
- Mention two structural differences between A and B.
- Name the kinds of blood that flow through A and through B respectively.
- In which one of the vessels referred to in (a) above does the exchange of gases actually take place?
Given below is a diagrammatic representation of certain types of blood vessels in human body.
Identify the types of blood vessels numbered 1 to 5.
Given below is a diagrammatic representation of certain types of blood vessels in human body.
Where can such an arrangement be found as an example - in lungs or in heart walls?
Complete the following sentence with appropriate words:
The three distinct types of blood vessels are _____, ______, and _________.
Multiple Choice Questions
Arteries are:
Why can you feel a pulse when you keep a finger on the wrist or neck but not when you keep them on a vein?
At the venous end of the capillary bed, the osmotic pressure is ______.
Why do veins have thin walls as compared to arteries?
Select the incorrect statements with respect to blood vessels.
- Capillaries are thin-walled having a single layer of ciliated epithelium.
- Arteries are pulsatile and devoid of valves.
- Portal vein starts as capillaries from one organ and ends as capillaries in another organ.
- All arteries carry oxygenated blood whereas all veins carry deoxygenated blood.
- Capillary walls bear fenestrae through which WBCs can move out by diapedesis.
Choose the correct answer from the options given below:
The blood vessel without a mascular layer in its wall ______.
