Which of the following is not true about veins?

Transport blood at low speed and low pressure

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They have no valves

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The veins carry blood to the heart

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They have minute pores on the walls

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Solution

The correct options are
B
They have no valves

D
They have minute pores on the walls

There are three types of blood vessels in the circulatory system, they are arteries veins and capillaries. The veins carry blood to the heart, they have thin walls and consist of valves. They transport blood at low speed and low pressure. Arteries carry blood from the heart, they have a thick wall and do not have valves. They carry blood at a high speed and at high pressure. Capillaries are thin vessels that connect veins and arteries together and they do not have valves. They have minute pores on the walls and they transport blood at a low speed and at low pressure.

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Question 21
Choose the correct statement that describes arteries.

(a) They have thick elastic walls, blood flows under high pressure; collect blood from different organs and bring it back to the heart.
(b) They have thin walls with valves inside, blood flows under low pressure and carries blood away from the heart to various organs of the body.
(c) They have thick elastic walls, blood flows under low pressure; carry blood from the heart to various organs of the body.
(d) They have thick elastic walls without valves inside, blood flows under high pressure and carries blood away from the heart to different parts of the body.

Q. State the true statements of the following:

(1)

Blood flowing in arteries is without high pressure.

(2)

Blood flowing in veins is without high pressure.

(3)

Veins have valves opening towards heart.

(4)

Arteries have valves opening towards heart.

Veins have valves to prevent the backflow of blood because the blood in veins flow ________.

Q. Which of the following statements are incorrect about the veins?
Statement1: Veins usually carry oxygenated blood.
Statement2: Veins carry blood from different organs of the body to the heart.
Statement3: Pulmonary vein is the only exception as it carries deoxygenated blood.

Q. Select the incorrect statements.
A. Arteries have thick elastic walls and veins have valves.
B. Capillaries are the smallest blood vessels supplying the tissues.
C. AV node is known as the pace setter of the heart.
D. Arteries carry blood towards the heart and veins carry blood away from the heart to different organs.

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