Question

(a) List the functions of blood.
(b) List the differences between arteries and veins.

Answer 1

(a) Following are the functions of blood:

• It carries oxygen and food to all cells of the body.
• It transports hormones.
• It transports waste materials to the excretory organs.
• It maintains fluid balance and body temperature.
• It protects against diseases.

(b)

Arteries	Veins
They carry blood from the heart to other parts of the body.	They carry blood from other parts of the body to the heart.
They have thick walls.	They have thin walls.
They are placed deeply under the skin, and blood can move under high pressure.	They are placed superficially, and blood cannot move under high pressure.
They do not have valves.	They have valves to prevent the backflow of impure blood to the organs.