Biology
Name the three kinds of blood vessels found in human beings. With the help of suitable diagrams, differentiate between them.
Answer
The three kinds of blood vessels found in human beings are Arteries, Veins and Capillaries.
Below diagram shows the differences between Artery, Vein and Capillaries:
| Arteries | Veins | Capillaries |
|---|---|---|
| An artery is a vessel which carries the blood away from the heart to other parts of the body. | A vein is a vessel which carries the blood from an organ towards the heart. | Capillaries are the terminal branches of an artery, which rejoin to form a vein. |
| An artery has thick, elastic and more muscular walls. | A vein has thin and less muscular walls with valves. | Walls of the capillary are made up of single layer of cells (endothelium) with no muscles. |
| The blood in it flows with jerk and under great force. | The valves prevent the back flow of the blood flowing towards the heart. | The wall of capillary is very thin, to enable an exchange of nutrients waste products and gases between the blood and the body fluids. |
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