Consider the following statements about veinsA. Veins carry CO2 rich blood from all parts of the body back to the heartB. Veins have thick wallsC. Veins have valves which allow blood to flow only towards the heartThe correct statement(s) is/area)Only Ab)Only Bc)A and Bd)A and Ce)None of the above/ More than one of the aboveCorrect answer is option 'D'. Can you explain this answer?

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BPSC (Bihar) Exam > BPSC (Bihar) Questions > Consider the following statements about veins...

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a)
Only A
b)
Only B
c)
A and B
d)
A and C
e)
None of the above/ More than one of the above

Correct answer is option 'D'. Can you explain this answer?

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Consider the following statements about veinsA. Veins carry CO2 rich b...

Statement A: Veins carry CO2 rich blood from all parts of the body back to the heart

This statement is correct. Veins are blood vessels that carry deoxygenated blood, which is rich in carbon dioxide, from various parts of the body back to the heart. The deoxygenated blood is then pumped to the lungs, where it gets oxygenated and releases carbon dioxide.

Statement B: Veins have thick walls

This statement is incorrect. Veins have thinner walls compared to arteries. The walls of veins are composed of three layers - the tunica intima (innermost layer), tunica media (middle layer), and tunica externa (outermost layer). The walls of veins are not as thick as the walls of arteries because veins do not experience the same high pressure as arteries do.

Statement C: Veins have valves which allow blood to flow only towards the heart

This statement is correct. Veins have valves that help to prevent the backflow of blood and ensure that blood flows only towards the heart. These valves are particularly important in the lower extremities, where blood has to work against gravity to return to the heart. The valves open when blood is flowing towards the heart and close to prevent blood from flowing backward.

Therefore, the correct statement is A and C, which means veins carry CO2 rich blood from all parts of the body back to the heart, and veins have valves which allow blood to flow only towards the heart.

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Consider the following statements about veinsA. Veins carry CO2 rich b...

Human circulatory system:

The organ system of human beings or other organisms which is responsible for the transport of materials inside the body is called the circulatory system.
Our circulatory system consists of a muscular pumping organ called the heart, arteries, veins, capillaries, and blood.
The heart has two atria and two ventricles.
The heart acts as a pump to push out blood.
The arteries, veins, and capillaries act as tubes or pipes through which blood flows. These tubes which carry blood are called blood vessels.
Arteries carry oxygenated blood away from the heart except the pulmonary artery carries deoxygenated blood.
Veins carry deoxygenated blood away from the heart except the pulmonary veins carry oxygenated blood.

Explanation:
The blood vessels carrying the blood from the body towards the heart are called veins.

Veins carry CO₂-rich blood from all parts of the body back to the heart. Hence, statement A is correct.

Veins have thin walls whereas arteries have thick elastic walls. Hence, statement B is incorrect.
Veins have valves to ensure blood flows only towards the heart. Hence, statement C is correct.

The one-way valves in veins prevent the blood from flowing backwards & and help to force the blood to move towards the heart.

Thus, the correct statements are A and C.

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Consider the following statements about veinsA. Veins carry CO2 rich blood from all parts of the body back to the heartB. Veins have thick wallsC. Veins have valves which allow blood to flow only towards the heartThe correct statement(s) is/area)Only Ab)Only Bc)A and Bd)A and Ce)None of the above/ More than one of the aboveCorrect answer is option 'D'. Can you explain this answer?

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