The diagrams given below are cross sections of blood vessels:



i. Identify the blood vessel A B and C 
ii. Name the parts labelled 1 to 3 
iii. Name the type of blood that flows through A
iv. Mention one structural difference A and B
v. In which of the above vessels does exchange of gases actually take place?

i. The blood vessel are
A – Artery
B – Vein
C – Capillarity

ii. The parts labelled 1 to 3 are:
1. Connective tissue layer
2. Lumen
3. Muscular layer.

iii. Name the type of blood that flows through A
Oxygenated blood

iv. The difference is:
A is an artery and has thick muscular walls which are elastic in nature.
B is a vein which has thin muscular walls which are less elastic in nature.

v. In C – Capillary