Question Video: Comparing and Contrasting Veins and Arteries | Nagwa Question Video: Comparing and Contrasting Veins and Arteries | Nagwa

Question Video: Comparing and Contrasting Veins and Arteries Biology • Second Year of Secondary School

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Which of the following correctly compares veins and arteries? [A] Veins have a muscular wall to carry blood at high pressure, and arteries have valves to prevent the backflow of blood. [B] The majority of both arteries and veins contain valves to prevent the backflow of blood. [C] Both arteries and veins have thick muscular walls to carry blood at high pressure. [D] Arteries have a muscular wall to carry blood at high pressure, and veins have valves to prevent the backflow of blood.

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Video Transcript

Which of the following correctly compares veins and arteries? (A) Veins have a muscular wall to carry blood at high pressure, and arteries have valves to prevent the backflow of blood. (B) The majority of both arteries and veins contain valves to prevent the backflow of blood. (C) Both arteries and veins have thick, muscular walls to carry blood at high pressure. Or (D) arteries have a muscular wall to carry blood at high pressure, and veins have valves to prevent the backflow of blood.

To answer this question, let’s go over what we know about arteries and veins and the roles they perform in the body’s circulatory system.

Both arteries and veins are blood vessels, but these two types of blood vessels perform two distinct functions. Arteries are responsible for carrying blood away from the heart and to the other organs of the body, whereas veins transport blood away from the body’s organs and back to the heart. As we know, the heart is responsible for pumping blood throughout the body, delivering oxygen and nutrients to the various organs and carrying away their waste products.

We mentioned earlier that arteries are responsible for carrying blood away from the heart towards the other organs of the body. Blood is pumped out of the heart at high pressure. This high pressure helps to make sure that blood doesn’t flow in the wrong direction. In order to withstand the high pressure, arteries have thick, muscular walls.

Veins, on the other hand, carry blood away from the organs of the body and back towards the heart. The blood pressure in veins is low. To prevent blood from flowing in the wrong direction, veins have special structures called valves at regular intervals. These valves only allow blood to flow in one direction. Since they do not have to withstand high blood pressure, veins have thinner walls than arteries do.

With the information we now have, we can identify that the correct answer is option (D). Arteries have a muscular wall to carry blood at high pressure, and veins have valves to prevent the backflow of blood.

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