Our body is composed of a very complex system consisting of cells, tissues and organ systems. Cells will form tissues such as muscle tissue, connective tissue, nerve tissue and epithelial tissue, which then work together to form an organ system as we know the lungs and heart are formed from the tissue system.
Epithelial Tissue Definition
Epithelial tissue is one of the tissues that covers the surface of the body and composes the outside of the organ.
The tissue is composed of very tight cells with little material between cells.
This causes the tissue to serve to protect the body from outside influences and outside substaeces that enter the body first through epithelial tissue.
Epithelial Tissue Characteristics
The following are some characteristics of epithelial tissue, among others:
- There is no material between the constituent cells
- Flat, stem or cube-shaped epithelial
- Cell shape varies depending on function and location
- It’s in the whole body.
- As cover and gland
- Composed of cells and extracellular molecules in the form of a matrix that are useful for binding tissue at the bottom
- There are several types of epithelial that indicate specialization in the form of tissue protrusions to expand the surface, move foreign particles or for movement.
- It has a surface that is not related to other tissues, while on the other surface is related to its lower membrane.
General Properties of Epithelial Tissue
The general properties of epithelial tissue include:
- Epithelial tissue consists of cells with clear borders and are tightly located with each other. Therefore, the epithelial tissue can be said to be a cellular tissue
- There are no blood vessels in the capillary tissue, food substances are given to the tissue diffusion of the capillary blood vessels located in the underlying tissue.
Epithelial Tissue Structure
Epithelial tissue can originate from the ectoderm (lining the outside of the body), endoderm (limiting organs), and mesoderm (limiting the body cavity). Cells from epithelial tissue are tightly arranged and continuously so that they have virtually no space between cells. All epithelial is usually separated from the tissues underneath by fibrous basement membranes.
The surface lining of the oral cavity, alveoli in the lungs, and tubules in the kidneys are all made of epithelial tissue. The lining of blood and lymph vessels is a special form of the epithelium called endothelium.
Epithelial Tissue Location
The epithelial is found both outside (the skin) and parts of the body cavity. The outermost layer of the skin consists of a layered flat epithelial and keratin epithelial cells.
The tissue that lines the inside of the mouth, esophagus, and part of the rectum consists of a layered flat epithelial that the mucosa is not keratinized. Other surfaces separating the body cavity from the outer environment are coated by a layered flat epithelial or transition epithelial.
The epithelial is also present in the lungs, gastrointestinal tract, reproductive tract, urinary tract, and as an endocrine and exocrine gland formation.
The outer surface of the cornea is covered with fast-growing and easily regenerated epithelial cells. Endothelial is a special form of epithelium found in the inner layers of blood vessels, heart, and lymphatic vessels. Another type, mesothelium, forms walls of pericardium, pleura, and peritoneum.
Basic Membranes in Epithelial Tissue
Epithelial tissue is attached to a basal membrane that acts as a stimulant, so that the epithelial can grow and regenerate after injury. Epithelial tissue does not have its own blood supply. Therefore, the basal membrane also acts as a selective permeable membrane that determines which substances can enter the epithelial.
Epithelial Tissue Function
Epithelial tissue has various functions depending on the position of the tissue, among others:
- As a protector,
- As a means of secretion,
- As an impulse receiver,
- As a filter or filtration tool,
- As an absorption tool,
- As a respiration tool.