A group of cells with similar structure and function is referred to as tissue. To simplify things, they can be broken down into four different types: epithelium, connective tissue, muscular, and neurological system.
The epithelial tissue
The tissue that covers the inside of the body’s cavities is referred to as the epithelium. It creates the body’s free surface, also known as the epidermis. Other places where collagen is found include the linings of the digestive and respiratory tracts, the blood and lymph vessels, as well as the peritoneum and pericardium, as well as the tubules (tiny tubes) of certain secretory glands like the liver and kidneys. These cavities have no communication with the outside world, and their lining membrane secretes a serous fluid. The shape, position, and function of epithelial cells determine how tissues of the epithelium are classified. Cells having only one layer of epithelial tissue are referred to as “simple,” whereas those with many layers are referred to as “stratified.” Epithelial tissue can be divided into three types: columnar, squamous, or cuboidal.
Columnar epithelial tissue
These epithelial cells are elongated, measuring more than twice as long as they are wide. Nuclei in nearby cells in columnar tissue are placed at the same level as the nuclei in the cells that make up the layer. In the uterus, in numerous digestive organs, and even in the respiratory passages, these cells can be found.
Colony-forming tissue primarily serves to secrete digestive fluids and absorb nutrients from digested food in the digestive system This tissue has a crown of microscopic hair-like structures known as cilia in specific locations (such as the nostrils, bronchial tubes, and trachea). Cilia help secretions and other materials travel along surfaces by creating motion.
They also serve as a protective barrier, keeping out extraneous substances that may otherwise find their way into the cavities.
Squamous epithelial tissue
Squamous epithelium tissue has a mosaic pattern made up of small, plate-like, or scale-like cells. Cells in the tympanic membrane (eardrum) or on the free skin surface form this tissue in single or multiple layers. The body’s primary defense tissue is squamous tissue.
Cuboidal epithelial tissue
In the body’s more specialized organs, such as the ovary and kidney, cuboidal tissue cells, which are cubical in shape, are discovered. Cuboidal tissue in the kidneys aids in fluid secretion and absorption.
This is the body’s structurally stabilizing tissue. It has a wide range of variations and is found throughout the body in most places.
Because it is rich in blood vessels and serves as a protective covering for internal organs and muscles, the connective tissue is also known as fibrous tissue because of the way it wraps around them.
Tissue-paper membranes and stiff bones are two extremes of connective tissue structure.
Cells and extracellular materials (things outside of cells) make up connective tissue. Fibers and ground substances are examples of extracellular materials. Proteins, water, salts, and other soluble components are found in the resulting powdered material. Depending on the type of tissue and where it is located, these extracellular components offer connective tissue varied degrees of elasticity and strength.
Areolar connective tissue
Areolar tissue has both elasticity and tensile strength because of the interlacing of its thin fibers in both directions. This sort of connective tissue may be found all over the body and is primarily responsible for holding everything together.
Because of its elasticity, areolar tissue allows for a great deal of mobility. Between the muscles, and on the outside of blood vessels and nerves, it is located as a protective covering. These blood arteries and nerves are linked together by the layer of areolar tissue.
Adipose connective tissue
The term “fatty tissue” refers to adipose tissue. At first glance, the adipose cell looks like a star. Fat storage in the cytoplasm causes the cell to swell and lose its star shape because the nucleus is pushed to the side. Adipose tissue is generated when this process occurs in large numbers of cells, crowding out the other cell types. Adipose tissue can be found all over the body, including beneath the skin, between the muscles, and around the joints and organs.
Adipose tissue stores energy-producing nutrients reduces heat loss from the body and provides support for numerous organs and delicate systems including the kidneys and blood arteries, as well as providing insulation for the brain and spinal cord.
Osseous connective tissue
“Bone tissue” is a type of thick fibrous connective tissue that is found in many different parts of the body including the tendons, ligaments, cartilage, and bones. The body’s structural structure is built on top of these tissues.