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3. The figures given below show diagrammatic cross sections of three kinds of blood vessels.1223AВСhes.(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 andthrough B respectively.(e) In which one of the vessels referred to in (a) above doesthe exchange of gases actually take place? ?buman beartthe11,1 |
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Answer» (a) A- Artery , B- Vein, C- Capillary(b) 1-Tunica externa, 2- lumen, 3- Tunica MEDIA, 4-Tunica interna(c)Arteries have thick, elastic, muscular walls whereas veins have thin walls with few elastic FIBRES. Veins have one-way valves whereas arteries do not have any valves.(d)A- Oxygenated blood B- Deoygenated blood(e) C- CapillaryHope you GOT your answers:) |
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