Answer:
Epithelial tissue is composed of cells laid together in sheets with the cells tightly connected to one another. Epithelial layers are avascular, but innervated.
Epithelial cells have two surfaces that differ in both structure and function.
The epithelial cells are nourished by substances diffusing from blood vessels in the underlying connective tissue. One side of the epithelial cell is oriented towards the surface of the tissue, body cavity, or external environment and the other surface is joined to a basement membrane. The basement layer is non-cellular in nature and helps to cement the epithelial tissue to the underlying structures.
Answer:
In order for something to be classified as living, it must grow and develop, use energy, reproduce, be made of cells, respond to its environment, and adapt. While many things meet one or more of these criteria, a living thing must meet all of the criteria.
cells
The cell is the fundamental unit of structure and function in living things. All organisms are made up of one or more cells.
Skin is made of 3 layers
the top Layer that is exposed to air is the epydermis
the middle layer is the dermis
the lowest and largest layer is the HYPODERMIS. This is the innermost and farthest from the surface of the skin
It 365.256 days.
Happy studying ^_^
