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Multiple Choice
Which of the following correctly describes veins?
A
Veins carry blood away from the heart.
B
Veins are primarily responsible for oxygenating blood.
C
Veins have thicker walls than arteries.
D
Veins contain valves to prevent backflow of blood.
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Verified step by step guidance
1
Understand the function of veins in the circulatory system: Veins are blood vessels that carry blood towards the heart. This is the opposite of arteries, which carry blood away from the heart.
Consider the role of veins in oxygenation: Veins are not primarily responsible for oxygenating blood. This process occurs in the lungs, where oxygen is exchanged for carbon dioxide in the blood.
Compare the structure of veins and arteries: Veins have thinner walls compared to arteries. Arteries need thicker walls to withstand the higher pressure of blood being pumped from the heart.
Identify the unique feature of veins: Veins contain valves. These valves are crucial as they prevent the backflow of blood, ensuring it moves in one direction towards the heart.
Conclude with the correct description: Based on the above analysis, the statement that correctly describes veins is that they contain valves to prevent backflow of blood.