1.

The diagrams given below are cross sections of blood vessels :(i) Identify the blood vessels 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 between A and B. (v) In which of the above vessels does exchange of gases actually take place ?

Answer»

(i) 1. Connective tissue layer 2. Lumen 3. Muscular layer 

(ii) Oxygenated blood. 

(iii) A = Artery, B = Vein, C = Capillary.

(iv)

AB
1. Thick muscular and elastic layer as wall.1. Thin muscular and less elastic wall
2. Narrow lumen2. Wide lumen

(v) in C/Capillary.



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