Veins are blood vessels that carry blood towards the heart. Most veins carry deoxygenated blood from the tissues back to the heart, exceptions are the pulmonary veins, which carry oxygenated blood to the heart from the lungs. The veins have thin muscular walls with wide lumen.

The arteries are the blood vessels that deliver oxygen-rich blood from the heart to the tissues of the body. Exception- pulmonary artery carries deoxygenated blood from the heart to the lungs. The arteries have thick muscular walls with very narrow lumen.

The diagram is given below indicates one phase of the heart contraction: Write down the difference in the composition of blood in 1 and 2.

The blood vessel labelled as '1' is the pulmonary artery, which contains the deoxygenated blood. It transfers the blood to the lungs for the oxygenation. The blood vessel labelled as '2' is the aorta, which contains the oxygenated blood. It transfers the blood to the different parts of the body.

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Deoxygenated blood means

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Important Questions on Transportation - The Circulatory System

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Science>Biology>Transportation - The Circulatory System>The Blood Vessels and Circulation

What will happen if pulmonary veins are tied with a thread?

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Science>Biology>Transportation - The Circulatory System>The Blood Vessels and Circulation

What is a vein?

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Science>Biology>Transportation - The Circulatory System>The Blood Vessels and Circulation

Why do arteries have thick, elastic walls ?

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Science>Biology>Transportation - The Circulatory System>The Blood Vessels and Circulation

Point out differences between an artery and a vein.

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Science>Biology>Transportation - The Circulatory System>The Blood Vessels and Circulation

What is the meaning of the term double circulation?

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Science>Biology>Transportation - The Circulatory System>The Blood Vessels and Circulation

Mention one structural difference between dorsal aorta and inferior vena cava.

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Science>Biology>Transportation - The Circulatory System>The Blood Vessels and Circulation

What is double circulation? What is it significance?

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Science>Biology>Transportation - The Circulatory System>The Blood Vessels and Circulation

Write a note on pulmonary circulation?

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Science>Biology>Transportation - The Circulatory System>The Blood Vessels and Circulation

The following simplified diagram refers to the outline plan of the circulation of blood in a mammal. Study the diagram and write the number and the name of the blood vessel in the case given below.

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