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Questions and Answers
Which of the following is the main reason why veins need valves?
Which of the following is the main reason why veins need valves?
- To increase blood flow
- To regulate blood volume
- To prevent backflow of blood (correct)
- To decrease blood pressure
What is the function of veins in the circulatory system?
What is the function of veins in the circulatory system?
- To regulate blood pressure
- To deliver nutrients to cells
- To transport oxygenated blood
- To store a high volume of blood (correct)
Why are veins more distensible than arteries?
Why are veins more distensible than arteries?
- Due to their capacity to expand (correct)
- Due to their thin walls
- Due to their large lumens
- Due to their high pressure
What percentage of blood volume do veins contain at any given time?
What percentage of blood volume do veins contain at any given time?
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Study Notes
Comparison: Veins as Blood Reservoirs
- Veins are thin-walled and have large lumens.
- Veins are low-pressure vessels.
- Veins have valves to prevent backflow of blood due to low blood pressure and gravity.
- Veins function as blood reservoirs.
- Veins contain approximately 64% of the blood volume at any given time.
- Veins have the capacity to distend or expand readily.
- Veins can store a high volume of blood even at a low pressure.
- Veins have larger lumens and thinner walls compared to arteries.
- Veins are more distensible than arteries.
- Veins are referred to as capacitance vessels.
- Veins have the ability to hold a high volume of blood due to their distensibility.
- Veins play a crucial role in maintaining blood volume and pressure.
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