Question

1. Give reasons for the following.
1. Ventricles have thicker walls than auricles.
2. Openings of auricles into ventricles a
guarded by valves.
3. Arteries have thick walls.
4. Leucocytes are called soldiers of our bod
5. Valves are present in veins but not in arte​

Answer 1

Answer:

1- because ventricle have blood at high pressure

2- auricles don't have any blood pressure and without any valves the blood may flow in reverse direction

3- because of blood pressure, otherwise they may burst

4- leucocytes kill foreign bacteria and viruses and increase immunity

5- because veins don't have blood pressure and without valves the blood may flow in reverse direction

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