Given below is a diagrammatic representation of certain types of blood vessels in human body.

(a) Identify the types of blood vessels numbered 1 to 5.

(b) Where can such an arrangement be found as an example -in lungs or in heart walls?

(a) In the given figure, the following parts as labelled as:

1 : Arterioles (smallest & final branch of artery)

2 : Artery (often shown as red coloured vessel indicating it carries oxygenated blood)

3 : Venules (smallest but united branch of blood vessel)

4 : Capillaries (arterioles & Venules break further & form capillaries)

5 : Veins (blood vessel shown as blue colored vessel indicating it carries de oxygenated blood)

(b) Such an arrangement can be found in the heart walls. (such a complex arrangement of vessels can be found in heart as it is the blood pumping organ . All the blood vessels finally meet & unite in the heart )