Epithelial Cells

• Epithelium is the outermost layer of cells that covers all surfaces within an organism.
• There are four types of epithelia based on shape: simple squamous, simple cuboidal, simple columnar, and stratified.
• The epithelium has two main functions: protection and absorption/secretion.
• Epithelium is the tissue that lines body cavities, covers organs, and forms glands.
• Epithelial cells facilitate secretion and absorption through their polarized organization and tight junctions.
• Epithelial cells form a protective barrier against environmental threats and regulate the movement of materials across tissues.
• The four types of epithelia are simple squamous, simple cuboidal, simple columnar, and stratified.
• Simple columnar epithelium consists of tall cells with nuclei located near the base.
• Simple cuboidal epithelium consists of cube-shaped cells with round or oval nuclei.
• Stratified epithelium contains multiple layers of cells.
• Squamous epithelium consists of flat cells.
• Stratified epithelium has multiple layers of cells.
• Cuboidal epithelium consists of cube-shaped cells.
• Pseudostratified columnar epithelium appears to have several cell layers but is actually only one layer thick.
• Transitional epithelium lines organs that can stretch, such as the urinary bladder.
• Transitional epithelium lines the urinary bladder, ureters, and parts of the kidney tubules.
• Epithelia are classified based on their shape (cuboidal, squamous, or columnar) and number of layers (simple or stratified).
• Simple squamous epithelium is thin and allows substances to pass through easily.
• Simple cuboidal epithelium has cube-shaped cells with nuclei at the base.
• Pseudostratified columnar epithelium appears to have multiple cell layers but is actually a single layer of cells.
• Ciliated pseudostratified columnar epithelium has cilia on its surface.
• Epithelial tissue is found lining body cavities, covering organs, forming glands, and making up skin.
• Simple epithelia consist of a single layer of cells, while stratified epithelia contain two or more layers of cells.
• Stratified squamous epithelium contains multiple layers of flat cells.
• Stratified cuboidal epithelium contains multiple layers of cube-shaped cells.
• Stratified squamous epithelium consists of several layers of flat cells.
• Stratified cuboidal epithelium consists of several layers of cube-shaped cells.
• Stratified squamous epithelium consists of several layers of flat cells that protect underlying tissues from abrasion.
• The epidermis is made up of several types of epithelial tissues that protect against physical damage and pathogens.
• Mucous membranes line internal surfaces such as the mouth, esophagus, stomach, intestines, respiratory tract, urinary bladder, and reproductive system.
• Ciliated pseudostratified columnar epithelium has cilia on its surface and functions in moving mucus or other substances along the tissue's surface.
• Transitional epithelium lines organs subjected to stretching and distention, such as the urinary bladder and ureters.