In biology, a tissue is a cellular organizational level that is halfway between individual cells and a fully developed multicellular organism. A tissue is a group of comparable cells with the same origin that have a specific purpose.
Also read: cell components and their functions
In turn, a collection of several tissues yields organs. Histopathology is the study of tissue in relation to disease, whereas histology is the study of tissue in general.
Also read: (DETAILED) DEFINITION OF UNICELLULAR AND MULTICELLULAR ORGANISMS
Table of contents
- Animal tissues
- Adhesive tissue
- Muscular tissue
- nervous system
- epithelial cells
- Skeletal Organs
The paraffin block, on which the tissue is attached and later segmented, the histology dye, and the optical microscope are the usual tools for analyzing tissues.
Also read: Nucleus| Definition, functions and Components
Recent developments in immunofluorescence, electron microscopy, and the use of frozen tissue sections have all improved the features that may be observed in tissues.
These technologies allow for the standard appearance of tissues to be analyzed in both health and sickness, greatly enhancing clinical diagnosis and prognosis.
Also read: Major difference between Eukaryotes and prokaryotes cells| definition and cellular components
Organs and other body structures are made up of several tissue types. Although the four types of tissues are generally well understood to be present in all animals, the appearance of these tissues can change based on the nature and form of the organism.
Also read: Chromosomes in humans| sequence structure, Discovery history and packing of DNA
For instance, depending on the animal categorization, the origin of the cells that contain a certain type of tissue may change over time.
Also read: Nucleus| Definition, functions and Components
In all animals, the epithelium is a product of the ectoderm and endoderm with a The endothelium, a particular type of epithelium that makes up the vasculature, is constructed with only a small amount of help from the mesoderm.
Also read: (DETAILED) DEFINITION OF UNICELLULAR AND MULTICELLULAR ORGANISMS
On the other hand, a real epithelial tissue can only be found in a single layer of cells that have formed a selectively permeable wall through occluding junctions known as tight junctions.
Also read: Chromosomes in humans| sequence structure, Discovery history and packing of DNA
Every surface of the body that is exposed to the world outside, such as the skin, airways, and digestive tract, is covered with this tissue. Its only purposes are absorption, secretion, and defense. A lamina at the base separates it from the other tissues below.
Also read: cell components and their functions
Adhesive tissue(connective tissue)
There are fibers in connective tissues. They are made up of cells that are split by a non-living material called an extracellular matrix. Connective Organs are held in place and given forms by tissue.
Bone and blood both contain connective tissue. They support and connect other tissues, as you could guess from the name. Connective tissue typically comprises cells dispersed across an extracellular matrix, in contrast to epithelial tissue.
Also read: Major difference between Eukaryotes and prokaryotes cells| definition and cellular components
Muscular tissue, often known as muscle tissue or muscular tissue, is the energetic contractile tissue that makes up the body. The purpose of muscle tissue is to produce force and initiate motion, whether it is internal organ movement or locomotion.
Also read: Chromosomes in humans| sequence structure, Discovery history and packing of DNA
There are three different types of muscle tissue: Muscles that line the inside of organs are called visceral or smooth muscles. Skeletal muscles are found attached to bones and allow for gross movements.
cardiac muscle, which is found in the heart and allows it to contract and pump blood throughout the body.
The longest collection of cells in the human body is found in the muscles.
nervous system
All of the cells that make up the central nervous system and peripheral nervous system are present in the nervous or neural tissue.
While neural tissue combines to produce the brain and spinal cord in the central nervous system, it also creates the cranial nerves, spinal nerves, and motor neurons in the peripheral nervous system.
epithelial cells
The cells that cover the surfaces of organs like the skin, airways, and reproductive system make up the epithelial tissues and the digestive tract's inner lining.
Also read: Major difference between Eukaryotes and prokaryotes cells| definition and cellular components
The semi-permeable, tight connections that connect the cells that make up the epithelial layer enable this tissue to serve as a barrier between the outside environment and the organ it covers. Epithelial tissue can also be concentrated to perform secretion and absorption functions in addition to this protective function.
Organisms are protected by epithelial tissue from microbes, damage, and water loss. The following is a list of the epithelia tissue's functions:
• The outer layer of skin is made up of epithelia cells on the body's surface.
• On the surface of the body, epithelial cells create the lining of the alimentary canal and mouth, protecting these organs.
• Epithelial tissues help with nutrient and water absorption.
• The elimination of waste is aided by epithelial tissues product.
epithelia tissue types
The following is a list of the several kinds of epithelial tissues:
Squamous epithelium is
• a cubic epithelium,
columns of epithelium,
• The glandular epithelium
• Epithelium with cilia.
Also read: cell components and their functions
Skeletal Organs
Three different forms of skeletal tissue exist. The hydrostatic skeleton, endoskeleton, and exoskeleton are the three different forms of skeletons or skeletal tissue. Along with invertebrates, cold-blooded animals also exhibit a hydrostatic skeleton. The endoskeleton is present in humans. In insects, the exoskeleton is present.
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