Chapter 18, Problem 1MC

Which statement does not accurately describe veins? (a) Have less elastic tissue and smooth muscle than arteries, (b) contain more fibrous tissue than arteries, (c) most veins in the extremities have valves, (d) always carry deoxygenated blood.

Summary Introduction

To determine:

The statement not accurately describing veins

1. Have less elastic tissue and smooth muscle than arteries,

2. contain more fibrous tissue than arteries,

3. most veins in the extremities have valves,

4. always carry deoxygenated blood.

Answer to Problem 1MC

Correct answer:

(d) Always carry deoxygenated blood

Explanation for the correct answer:

Option (d) is given as veins always carry deoxygenated blood. The veins are the blood vessels that are responsible for carrying the blood from all the body parts to the heart. They generally carry the deoxygenated blood to the heart from the different body parts, but the pulmonary vein is an exception as it carries the oxygenated blood to the heart from the lungs. Hence, option (d) is an incorrect answer.

Explanation of Solution

Explanation for the incorrect answers:

Option (a) is given as veins have less elastic tissue and smooth muscle than arteries. The elastic tissues and the smooth muscles in the veins are less in number as compared to the arteries. It is a correct description about veins. Hence, option (a) is an incorrect answer.

Option (b) is given as veins contain more fibrous tissue than arteries. Arteries generally carry the oxygenated blood. Veins contain more fibrous tissues and have valves. It is a correct description about veins. Hence, option (b) is an incorrect answer.

Option (c) is given as most veins in the extremities have valves. It is a correct description about veins. Hence, option (c) is an incorrect answer.

Conclusion

The veins generally carry deoxygenated blood, but the pulmonary vein is an exception as it carries the oxygenated blood to the heart from the lungs.