What is the function of the epithelium in the human body?
The epithelium serves as a protective barrier, covering body surfaces and lining cavities to shield underlying tissues from damage, pathogens, and dehydration. It also facilitates absorption, secretion, and sensation, playing crucial roles in the respiratory, digestive, and integumentary systems.
What are the different types of epithelial tissue?
The different types of epithelial tissue are simple squamous, simple cuboidal, simple columnar, stratified squamous, stratified cuboidal, stratified columnar, pseudostratified columnar, and transitional epithelium.
What are common diseases or disorders associated with epithelial tissue?
Common diseases or disorders associated with epithelial tissue include carcinomas (such as squamous cell carcinoma and adenocarcinoma), eczema, psoriasis, and epithelial dysplasia. These conditions can lead to abnormal growth, inflammation, or degeneration of epithelial cells in various parts of the body.
How does the epithelium repair itself after injury?
The epithelium repairs itself through a process called re-epithelialization, which involves the migration, proliferation, and differentiation of epithelial cells surrounding the wound. These cells cover the damaged area, aided by the deposition of a new extracellular matrix, restoring tissue integrity and function.
How does epithelial tissue contribute to the body's barrier function?
Epithelial tissue forms a protective barrier on body surfaces and linings, helping to prevent pathogen entry, dehydration, and chemical damage. The tight junctions between epithelial cells restrict the movement of substances between them, ensuring a controlled environment and contributing to the body's immune defense.