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The main difference between tissue and organ is that the tissue is the group of cells that perform a similar function while the organ is the group of tissues that perform a similar function.
Tissue vs. Organ
There is a great diversity of life that exists on earth but, the cell is known as the basic structural and functional unit of life. All life forms are made up of the cell, but its complexities vary from organism to organism. That is why there are different types of species on earth. Some are unicellular while others are multi-cellular. Unicellular organisms are the organisms that are made up of a single cell, e.g., protozoans while multi-cellular organisms are the organisms that are made up of a large number of cells. Such multi-cellular organisms required a proper organization of cells in the body to perform different works. So, in multi-cellular organisms cells are organized properly in different specific levels. Cell, tissue, organ, and organ system are the level of organization in multi-cellular organisms. Some cells combine to make tissue; tissues combine to make an organ, different organs combine to make an organ system and different organ systems combine to make a complete individual. So, the tissue is the group of cells performing the same function while the organ is the group of tissues working together. Connective tissue is an example of tissue while the stomach is an example of an organ. In this article, we will highlight the important differences between them.
What is Tissue?
The word “tissue” is derived from the French word “tissu” which means something that is woven. The tissue is a group of related cells that are performing a specific function in the body. So, the tissue is a cellular organizational level that exists between a cell and an organ. The study of animal or human tissues is known as histology while that of plant tissues is known as plant anatomy. Animals are made up of four types of tissues, i.e., epithelial tissue, muscular tissue, connective tissue, and nerve tissue. Epithelial tissue is the type of tissue that lines the cavities and the surfaces of the body and protects the body from mechanical damage and dehydration. Connective tissue connects and binds the separate tissues and organs together. Muscular tissue provides movement to the body and its different parts. Nerve tissue provides coordination to different parts of the body by transmitting nerve impulse in response to any external or internal stimuli. Plants also made up of three types of tissues known as epidermis, ground tissues and vascular tissues. The epidermis is the tissue that lines all the body parts of the plant such as leaves, stem, and roots. Vascular tissues transport water, food, and nutrients, etc. throughout the plant body. Ground tissue is the tissue that plays an important role in photosynthesis and storage of food.
What is Organ?
An organ is that part of an organism that performs a set of specific functions in the body and is made up of several types of tissues. Different types of organs are present in a multi-cellular organism and are performing different specific functions. Some main organs of the body are the brain, lungs, liver, heart, and kidney. The brain is part of the central nervous system and provides coordination in response to any external or internal stimuli. Lungs are involved in the exchange of gasses between the individual and its environment. The liver acts as a storage organ of the body and stores glycogen etc. The heart is the organ that pumps blood to all parts of the body. The kidney is the main excretory organ of the body and plays an important role in the removal of waste products from the body. In plants, root stem and leave, etc are considered as organs. Different organs of the body combine to make an organ system.
- A group of cells that is performing a specific function in the body of an organism is known as tissue while a group of tissues performing the specific function in the body of an organism is known as an organ.
- The tissue is an evenly distributed structure while the organ is a hollow structure.
- The tissue is made up of similar cells whereas an organ is made up of different type of tissues.
- A tissue is a smaller organization level while an organ is a larger one.
- A tissue requires less energy to perform its function, but an organ requires a greater amount of energy to perform its work.
- A tissue is a structural component of an organ while an organ is a structural component of an organ system.
- The tissue is capable of performing a single function of the body while an organ is capable of performing several functions of the body.
- In case of any injury, tissue can be repaired by fibrosis and regeneration while the organ is repaired by repairing its tissues.
- Connective tissue and muscle tissue etc. are the example of tissues while heart, liver, and kidney, etc. are the examples of organs.
From the above discussion, it is concluded that both tissue and organ are the organizational levels of a multicellular organism. While tissue is a smaller level that is made up of similar cells and performs a specific function, but the organ is a higher level that is made up of a group of tissues and performs different specific functions. Connective tissue is an example of tissue while the liver is an example of an organ.