Question

6. The figures given below show diagrammatic
cross sections of three kinds of blood vessels.
2
2
A
B
С
(a) Identify the blood vessels A, B and C.
(b) Name the parts labelled 1-4.
(c) Mention two structural differences between Aand
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?​

Answer 1

Explanation:

(i) A = Artery

B = Vein

C = Capillary

(ii) 1. Connective tissue layer

2. Lumen

3. Muscular layer

(iii) Oxygenated blood

(iv) A has thick muscular and elastic layer as a wall with narrow lumen whereas B has a thin muscular layer, a less elastic wall with the wide lumen.

(v) In a capillary vessel, the exchange of gases like oxygen and carbon dioxide actually takes place.