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Tissue

A group of cells that act together to carry out a specific function in the body. Examples include muscle tissue, nervous system tissue (including the brain, spinal cord, and nerves), and connective tissue (including ligaments, tendons, bones, and fat). Organs are made up of tissues.

PubMed Health Glossary
(Source: NIH - National Institute of General Medical Sciences)

Terms to know

Cells
The basic subunit of any living organism; the simplest unit capable of independent life. Although there are s...
Differentiation (Cell Differentiation)
The series of biochemical and structural changes by which an unspecialized cell becomes a specialized cell wi...
Undifferentiated
A term used to describe cells or tissues that do not have specialized ("mature") structures or functions....

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