1.

The diagram 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) (A) Artery (B) Vein (C) Capillary 

(ii) 1- Tunica externa/connective tissue layer 

2- Lumen 

3- Tunica media/Muscular layer 

(iii) Oxygenated blood flows through A. 

(iv) Arteries are thick walled and veins are thin walled. 

(v) The exchange of gases takes place in C (capillaries).



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