4.Prevent mechanical damage.
Soft subcutaneous fat has a buffer effect on external collision and extrusion.
The normal skin is hard, the epidermal cells are tightly packed, and the elastic fibers in the dermis and the crisscrossed collagen fibers are tough and elastic.
To a certain extent, the skin can withstand various external mechanical stimuli, such as friction, stretching, extrusion and collision, and quickly return to normal without irreversible changes.
5.Prevent water and electrolyte loss.
First, the unique structure of the cuticle is enough to prevent dehydration.
Water molecules must pass through the stratum corneum, passing through several tightly arranged keratinocytes and lipid-rich cellular material.