What is Shock in first aid?

Option B

In medical study, Shock is the serious and threatening condition caused by  Lack of oxygen reaching the boy's cells and tissues. The types of shock are

1. Hypovolemic Shock : Loss of blood volume of fluids from the blood.
2. Distributive Shock : Decreases ability of blood to carry oxygen to the tissues.
3. Cardiogenic Shock : Irregular or absence of functioning of the heart preventing normal, effective circulation.
4. Obstructive Shock : A physical obstruction within the heart or great vessels.