Question

3. The figures given below show diagrammatic cross
sections of three kinds of blood vessels.
1
2
2
3
A
В
С
hes.
(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 and
through B respectively.
(e) In which one of the vessels referred to in (a) above does
the exchange of gases actually take place? ?
buman beart
the
11,
1​

Answer 1

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- Capillary

Hope you got your answers:)