Arteries and Veins
Arteries and Veins
Arteries carry oxygen rich blood from heart to all parts of the body. Blood flows through the arteries have thick, elastic walls. The arteries branch out into smaller tubes known as capillaries when they enter the organs.
Veins carry the oxygen deficient and carbon dioxide rich blood back to the heart. Veins have thinner walls than arteries since blood flows at a lower pressure. Veins have valves that prevent backflow of blood flows at a lower pressure. Veins have valves that prevent backflow of blood, so blood flows in one direction, that is, towards the heart.
Capillaries are thin walled blood vessels and form a network of extremely tiny blood vessels between arteries and veins. The walls of the capillaries are so thin that diffusion of gases and chemical substances takes place very easily.
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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. |
Which of the following are correct ? (a) The thinnest blood vessels are called Arteries . (b) Arteries are wide, elastic and thick walled vessels as they carry blood away from the heart to the limbs and organs of the body. (c) The blood in veins flow under less pressure than that in arteries. | |||
| Right Option : B | |||
| View Explanation | |||
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 | |||
______________________ carry carbon dioxide-rich blood back to heart from other parts of the body. | |||
| Right Option : B | |||
| View Explanation | |||
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