Not always. For example the pancreas while largely made of the same type of cells performing the same function (making digestive enzymes needed in the small intestine) contains little spots called the Islets of Langerhans that are entirely different and have a totally unrelated function (making the hormone insulin needed in the blood to regulate glucose metabolism). Both types of cells are integral parts of the one organ.
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Cells with similar function and/or structure make up tissues in the body.
A tissue is a group of cells that work together to perform a specific function, such as muscle tissue or nerve tissue. These cells are organized in a specific structure and are interconnected. A group of cells that are merely clumped together lack the organization and coordination seen in tissues, and do not necessarily have a specific function or structure.
A group of cells grouped together to perform a similar function is a tissue. FOr example, all of your mucels perform a similar function. The muscles are actually tissues consisting of a group of similar cells.
A group of cells working together form a tissue. Different tissues working together form an organ.
Tissue. Tissue is a group of similar cells that work together to perform a specific function in an organism.