Question

Give reasons:
(a) Arteries have thick walls.

(b) Veins have valves.

(c) WBCs are called soldier of our body.

Answer 1

Answer:

a) arteries have thick wall so as to prevent bursting from high blood pressure in them.

b) veins have valves to prevent backflow of blood

c) WBCS are called soldier of our body because they provide immunity and protect our body from every pathogenic attack

Answer 2

Answer:

I) arteries transfer blood from heart to other tissues in body with high pressure arteries have thick walls to prevent internal bleed due to high pressure

2) Veins contain valves to control the flow of bloods

3) WBC are of two types granulocytes and agranulocytes

Granulocytes have diff types as neutrophiles, basophines, acidophiles which contains antibodies which help in defence of body from foreign substances.

from

- a NEET aspirant