Arteries and Veins
Arteries and Veins
Three types of blood vessel namely, arteries, veins and capillaries are involved in blood circulation. They are all connected to form one continuous closed system.
1. Arteries: These are wide, elastic and thick walled vessels as they carry blood away from the heart to the limbs and organs of the body. They have thick, elastic walls to withstand the high pressure of the blood emerging from the heart.
2. Veins: These bring blood from the tissues and organs to the heart. The blood in veins flow under less pressure than that in arteries. Therefore, veins do not have thick walls. But veins can accommodate more blood. Veins have valves that allow blood to flow in one direction only.
3. Capillaries: Arteries branch out into smaller and thinner blood vessels called arterioles. These divide into still smaller vessels to provide blood to all the cells. The thinnest blood vessels are called capillaries. Their walls have just one layer of squamous cells. These walls are permeable, so water and dissolved substances pass in and out, exchanging oxygen, carbon dioxide, dissolved nutrients and waste products with the tissues around the capillaries. These capillaries form a dense network, reaching out to every part of the human body. The flow of blood is slow in capillaries.
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Arteries |
Veins |
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1. They carry blood away from the heart. |
They carry blood to the heart. |
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2. They are thick walled tubes. |
They have thinner walls. |
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3. They are deeply placed under the skin, and blood moves under high pressure. |
They are superficially placed and blood does not move under pressure. |
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4. There are no valves inside arteries. |
There are a series of valves present in the veins. These prevent the blood from flowing back to the organs. |
Which of the following are correct ? (a) Arteries are wide, elastic and thick walled vessels as they carry blood away from the heart to the limbs and organs of the body. (b) Veins have valves that allow blood to flow in one direction only. (c) The walls of the capillaries are so thin that diffusion of gases and chemical substances takes place very easily. | |||
| Right Option : D | |||
| View Explanation | |||
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| Right Option : B | |||||
| View Explanation | |||||
The impure, deoxygenated blood, rich in waste materials is carried by the ________________ | |||
| Right Option : C | |||
| View Explanation | |||
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