The diagram given below shows the cross-section of two kinds of blood vessels.

Identify the blood vessels $a$ and $b$ . In each case give a reason to support your answer.

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Solution

Blood vessel labelled as

$(a)$ is an artery because it has a narrow lumen and thick muscular wall and
$(b)$ is a vein because it has a wider lumen and thin muscular wall.

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iii) When are the sound "LUB" and "DUP" produced during a heartbeat?
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