Which of the following best describes varicose veins?

• A. Capillaries that have ruptured due to high blood pressure
• B. Veins that have constricted due to cold temperatures
• C. Arteries that have hardened due to plaque buildup
• D. Veins that have become enlarged and twisted due to valve failure

Answer: (D)

Verified step by step guidance

1. Understand the structure and function of veins: Veins are blood vessels that carry blood back to the heart. They have valves that prevent the backflow of blood, ensuring it moves in one direction.
2. Learn about the role of valves in veins: Valves are crucial in maintaining proper blood flow. When they function correctly, they prevent blood from pooling in the veins.
3. Identify what happens when valves fail: If the valves in the veins become weak or damaged, they can fail to close properly, leading to blood pooling and increased pressure within the veins.
4. Recognize the physical changes in veins due to valve failure: The increased pressure can cause veins to become enlarged and twisted, which is characteristic of varicose veins.
5. Differentiate varicose veins from other vascular conditions: Unlike capillaries rupturing or arteries hardening, varicose veins specifically involve the enlargement and twisting of veins due to valve failure.