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प्रश्न
Name the three kinds of blood vessels found in human beings. With the help of suitable diagrams, differentiate between them.
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उत्तर
The three kind of blood vessels found in human beings are arteries, veins and capillaries.
- Arteries are the blood vessels that carry blood from the heart to the various parts of the body.
- Veins are the blood vessels that carry blood from the body parts to the heart
- Capillaries: These are the terminal branches of an artery, which rejoin to form a vein. A capillary is a very narrow tube whose walls have a single layer of cells with no muscles. Although the wall of a capillary is very thin, yet an exchange of nutrients, waste products and gases take place between the blood and the body fluids.
Differences:
Arteries
- Carry blood away from the heart.
- Have thick and more muscular walls.
- Carry oxygenated blood (except pulmonary artery which carries deoxygenated blood).
- The blood flows with jerks and under great force.
Veins
- Carry blood towards the heart.
- Have thin and less muscular walls.
- Carry deoxygenated blood (except pulmonary vein which carries oxygenated blood).
- The blood flows smoothly and under little pressure
Capillaries
- Arteries after entering an organ divide into number of smaller branches called arterioles which further divide repeatedly to form a network of fine branches called capillaries.
- The walls of the capillaries are very thin and are one cell deep.
- The Capillaries after the metabolic exchange unite to form larger vessels called venules, which again unite to form a vein.
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संबंधित प्रश्न
Name the following:
The valve present in between the chambers on the right side of the human heart.
Give any three differences between an artery and a vein
In which organ of our body does blood get oxygenated?
State the Location: Bundle of His
All the waste products of the body are excreted through the circulatory system.
Thin tube-like structures which are the component of circulatory system are called blood vessels.
______ prevent blood clotting.
Name these:
Three components of circulatory system.
Name these:
Three circulating fluids in human body.
Given diagram is a schematic representation of the circulatory system in humans. Study the same and answer the questions that follow:
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- Label the parts 1 and 4 indicated in the diagram.
- Which of the above mentioned number is the thickest artery? Also write its name.
- Mention the number and chamber of the heart which has the thickest muscular wall.
- Which of the above numbers/structures has the maximum number of blood capillaries?
- Draw neat and labelled diagrams of the transverse section of vena cava and the part numbered as 3. Make sure to show the structural differences between these two in the diagram.
