Squamous epithelial cells can be classified into two main types:
1. Simple Squamous Epithelium: This type consists of a single layer of flattened cells. It is primarily involved in processes like diffusion, filtration, and secretion. Examples include the lining of the alveoli in the lungs and the endothelium of blood vessels.
2. Stratified Squamous Epithelium: This type consists of multiple layers of cells, with the outermost layer being flat and scale-like. It is mainly involved in protection against mechanical stress and abrasion. A prominent example is the epidermis of the skin.
