MICROANATOMY

Detailed explanation-1: -The main function of transitional epithelium is to allow tissue to expand and contract. For example, the transitional epithelium lines the inner walls of the urinary bladder, and this tissue allows the bladder to expand when the bladder fills with urine.

Detailed explanation-2: -The transitional epithelium cells stretch readily in order to accommodate fluctuation of volume of the liquid in an organ (the distal part of the urethra becomes non-keratinized stratified squamous epithelium in females; the part that lines the bottom of the tissue is called the basement membrane).

Detailed explanation-3: -Simple squamous epithelial cells function as mediators of filtration and diffusion. Due to their simple and thin construct, they allow for easy transmembrane movement (i.e. across the membrane, and through the cell) of small molecules.