4(a)
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?
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(i) The blood vessels A, B, C are:
- A → Artery
- B → Vein
- C → Capillary
(ii) Parts labelled 1 to 3 are:
- 1 → Connective tissue / Tunica externa
- 2 → Lumen
- 3 → Muscular tissue / Tunica media
(iii) Oxygenated blood flows through A.
(iv) Arteries have narrow lumen whereas Veins have wide lumen.
(v) Capillary (i.e., blood vessel C marked above)