Question

Given below are the diagrammatic sketches of two kinds of blood vessels.

(a) Identify the two kinds of blood vessels A and B.
(b) name the parts numbers 1 to 6
(c) Mention any two main differences between A and B.

Answer 1

(a) A is artery, B is vein.
(b) 1- Endothelium of the artery,
2 - Middle layer of smooth muscles and elastic fibres of the artery,
3 - External layer of connective tissue of the artery,
4 - Endothelium of the vein,
5 - Middle layer of smooth muscles and elastic fibres of the vein,
6 - External layer of connective tissue of the vein.
(c) An artery has thick muscular walls and a narrow lumen. It carries blood away from the
heart towards any organ.
A vein on the other hand has thin muscular walls and a wider lumen. It carries blood away
from an organ towards the heart.