describe the structural and functional of any three types of epithelial tissues
Answers
Answer:
Epithelial tissues line the outer surfaces of organs and blood vessels throughout the body, as well as the inner surfaces of cavities in many internal organs.
An example is the epidermis, the outermost layer of the skin. There are three principal shapes of epithelial cell: squamous, columnar, and cuboidal.
The three principal shapes associated with epithelial cells are—squamous, cuboidal and columnar.
- Squamous epithelium is composed of cells that are wider than their height (flat and wide).
- Cuboidal epithelium is composed of cells whose height and width are approximately the same (cube shaped).
- Columnar epithelium is composed of cells taller than they are wide.
By layer, epithelium is classed as either simple epithelium (one cell thick) or stratified epithelium (two or more cells thick), and both can be made up of any of the cell shapes. When epithelium is stratified, it is classified by the shape of the cells at the top or uppermost layer. A notable exception is pseudostratified epithelium. In this type of epithelium, taller simple columnar epithelial cells appear to have several nuclei at different heights, giving the appearance of stratification. However, in this type of epithelium, all the cells are attached to the basement membrane.
Urothelium (formerly called transitional epithelium) is another type of unique epithelium in which cells can change from squamous to cuboidal, depending on the amount of tension on the epithelium.
PLEASE MARK BRAINIEST
Answer:
Epithelium is one of only 4 types of human body tissues. Like all types, it is formed by cells within an extracellular matrix (ECM).
The cells in this tissue are tightly packed within a thin ECM. Forming sheets that cover the internal and external body surfaces (surface epithelium) and secreting organs (glandular epithelium). Functions of epithelial tissue are secretion, protection, absorption, transportation and special sensory receptive.
Think epithelial tissue is not so interesting? What until you read about all its specializations! This page will introduce you to the histology, characteristics and functions of epithelial tissue.