SKIN ONLINE IGCSE COORDINATED SCIENCE CLASS Parts Function Epidermis Top Layer of the skin. Provides protection against bacteria and germs Dermis The layer where most receptors are found Pain Receptors To detect pain Touch Receptors To detect touching (smooth or rough) Pressure Receptors To detect pressure on the skin.

An electric field is a region of electrical charge. We have two types of charges that create an electric field. Positive charge and negative charge. Positive charge: Field lines are extended outward from the positive charge Negative charge: Field lines are extended inward into the negative charge The diagram.

Rotational symmetry is the number of times a shape can fit into itself when it is rotated 360 degrees about its centre. Lets look at some of the examples to give you a better pricture.