What is the definition of 'tissue' in a biological context?

In a biological context, 'tissue' is defined as a group of similar cells that work together to perform a specific function. This definition is essential in understanding the hierarchical organization of biological structures. Tissues can vary in types, such as connective, epithelial, muscle, and nervous tissues, each fulfilling distinct roles within an organism.

This concept is fundamental in anatomy and physiology, as tissues combine to form organs, which then work together in organ systems. The specificity of function among cell groups within the tissue emphasizes how cells coordinate their activities for the overall benefit of the organism.

Other choices, while related to biological structures, do not accurately capture the essence of what constitutes tissue. For example, a type of organ refers to a higher level of biological organization that includes multiple tissues working together, whereas a collection of different kinds of cells would pertain more to a mixed cellular environment rather than a homogeneous group focused on a united function. Lastly, a component of the skeletal system is too narrow, as tissues can be found throughout various systems in the body, not just in the skeletal system.