Question

III. SHORT ANSWER QUESTIONS - I
1. Other than capillaries, which are the two types of blood vessels? How are they different in terme
of direction of blood-flow?
? Mention the role of the valves in maintaining blood-flow in the heart.​

Answer 1

Answer:

(a) Other than capillaries there are two types of blood vessels.

1. Arteries
2. Veins

Basis                          Arteries                                                           Veins

Direction             Arteries have to carry/pump            Veins have to carry

of Blood flow      oxygenated blood away from          de-oxygenated blood                                 the heart to various                          towards the heart

                            parts of the body.                              from various body      

                                                                                         parts.

(b)

1. Veins have to carry blood towards the heart.
2. Thus, the blood must flow in one direction only (unidirectional).
3. To ensure the unidirectional flow of blood, and prevent the backflow of blood, veins have valves.
4. Valves in veins also prevent the mixing of oxygenated and deoxygenated blood.

Hope you got that.

Thank You.