Tissues: Epithelial

single layer of flattened cells all touching the basement membrane; all have a free surface

• diffusion
• filtration

• walls of capillaries, bv, and heart (endothelium)
• serous membranes (mesothelium)
• alveoli; air sacs of lungs

single layer of cube-shaped cells with centrally located nuclei; all cells have a free surface and all cells touch the basement membrane

• secretion
• to release a good (useful) product
• absorption (take back in and take to cells)

• renal tubules
• glands
• lower parts of respiratory tree

Single layer of column-shaped cell; nucleus toward the basal region of hte cell; all cells have a free surface and all cells touch the basement membrane

• generally secretion (including mucus)
• absorption
• movement (ciliated surface)

• human digestive tract
• many glands of the body

single layer of column-shaped cells; every cell touches the basement membrane, but not every cell reaches the free surface; nuclei at different levels; appears layered; simle because all toouch the basement membrane 

• protection
• secretion of mucous
• due to cilia, movement of materials

upper respiratory tract (pharynx, trachea, etc)

consists of many layers of cells; upper layers squamal shaped; the basal layer touches the basement membrane; all cells are alive becaues of thickness; it protects underlying tissue

because of thickness, it funcitons in protection of underlying tissues

• areas continuous with skin
• oral cavity, parts of esophagus, etc

many layers fo cells; upper layers are squamous shaped; any basal layer touches basement membrane; upper layers of cells are dead and filled with a waterproffing protein called keratin (no nuclei)

protection of underlying tissue; frist barrier or defense is skin

epidermis; nails; hair; anything derived from epidermis of skin