What are separate body structures that perform specific functions called?

The term for separate body structures that perform specific functions is "organs." Organs are made up of different types of tissues that work together to carry out particular tasks crucial for the body's overall function. For instance, the heart is an organ that pumps blood, the lungs facilitate respiration, and the kidneys filter waste from the blood. Each of these organs has a unique role in maintaining homeostasis and ensuring the body's health.

Understanding this concept is essential for estheticians, as it helps them appreciate the interconnectedness of bodily systems and how treatments can impact overall health. In contrast, cells represent the basic building blocks of life, while tissues are groups of similar cells that serve a common function. Systems encompass groups of organs working together to perform complex functions, but they are broader and do not refer to individual structures.