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Question

The figure given below shows diagrammatic cross-sections of three kinds of blood vessels.

(a) Identify the blood vessels A, B and C.
(b) Name the parts labelled 1-4.
(c) Mention two structural differences between A and B.
(d) Name the kinds of blood that flow through A and through B respectively.
(e) In which one of the above vessels referred to in (a) above does the exchange of gases actually take place?

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Solution

a) The blood vessel is
A – Artery
B – Vein
C – Capillary

b) The parts labelled 1 to 3 are:
1. Connective tissue layer (tunica adventitia)
2. Lumen
3. Muscular layer (tunica media)

4. Endothelium layer (tunica intima)


c) 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.

d) A: Pureblood or oxygenated blood.

B: Impure blood or deoxygenated blood.

e). In C – Capillary


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