What defines a tissue in biological terms?

A tissue is defined as a group of similar cells that originate from the same developmental source and work together to perform a specific function. This definition underscores the collective nature of tissue, as individual cells often cannot accomplish specific tasks independently. Instead, they collaborate, providing a coordinated response to fulfill functions essential for the organism's survival.

For instance, muscle tissue consists of muscle cells that facilitate movement, while nerve tissue consists of neurons and glial cells that transmit signals throughout the body. This characteristic of having a consistent cell type and a shared purpose sets tissues apart from other biological structures, like organs or individual cells. Hence, understanding this definition is crucial for grasping more complex biological concepts such as organ systems and overall bodily functions.