tissue

Tissue is a group of similar cells that work together to perform a specific function in the body. In humans and animals, there are four main types of tissues: epithelial (which covers surfaces), connective (which supports and connects different parts), muscle (which enables movement), and nervous (which transmits signals). Each type of tissue has a distinct role, and they combine to form organs, such as the heart or skin. Understanding tissues is essential for fields like biology and medicine, as they are fundamental to the structure and function of all living organisms.