thin wall - rapid diffusion
small gaps - allow diffusion and actv tspt
goblet cells in lung epithelium - secrete mucus to trap bacteria
ciliated epithelium - waft mucus out of the lungs
squamous - stretch and recoil around a blood vessel
there are about another 10 types of specialised epithelium tissues and cells in the human body
There is usually more ECM than cells in connective tissue. Epithelium is a highly cellular tissue, mostly composed of cells with little matrix.
Epithelium is a tissue that covers surfaces and lines cavities, serving a protective and absorptive function. Connective tissue supports and connects other tissues and organs in the body, providing structural integrity, cushioning, and flexibility. Epithelium is composed of closely packed cells with little extracellular matrix, while connective tissue has cells dispersed within a matrix of fibers and ground substance.
The layer between the epithelium and connective tissue is called the basement membrane. It is a thin, fibrous structure that provides support and anchoring for the epithelium, acting as a barrier and facilitating the exchange of nutrients and waste between the two tissue types. The basement membrane is composed of extracellular matrix components, including collagen, laminin, and glycoproteins.
The epidermis is made up of stratified squamous epithelium.
The lungs tissues are made up mainly of squamous epithelial tissue (called alveolar epithelium in the lungs). This type of tissue serves a critical function within the lungs because it allows the transfer and exchange of gases with little or no resistance. The advantages are a short distance between the Oxygen in the alveoli and the blood in the capillaries.The lungs also contain ciliated epithelium. A function of ciliated epithelium is stimulation of goblet cells to produce a mucous-like substance that not only lubricates but also traps pathogens and particles in the bronchi.
The connective tissue found beneath all types of epithelium is called the basement membrane. It provides structural support to the overlying epithelial cells and helps in anchoring them to the underlying tissues. The basement membrane also plays a role in filtration and diffusion of substances between the epithelial cells and the underlying tissues.
The avascularity of epithelium and cartilage reduces the risk of bleeding in case of injury. It also helps maintain a stable environment for cell function and tissue structure.
They are sheets of cells [Epithelial tissue or epithelium] that covers the body surface or lines a body cavity. They form bounderies between different environments and nearly all substances received or given off by the body must pass through some sort of epithelium.
Simple columnar epithelium is a type of epithelial tissue that is specialized for absorption and secretion. It is typically found lining the digestive tract where it helps in the absorption of nutrients. The columnar shape of the cells allows for efficient transport of molecules across the tissue.
the walls of the alveoli are very thin but strong layers of elastic tissue lines with a single layer of flattened epithelium.
Transitional epithelium (also known as urothelium) is a type of tissue consisting of multiple layers of epithelial cells which can contract and expand. The flexibility is needed to function and protect the body
Basement membrane is the thin, non-living layer that anchors epithelium to connective tissue. It provides structural support and helps regulate the movement of molecules between the epithelium and connective tissue.