Which of the following lists the human body's components from smallest to largest?

The correct answer is based on the hierarchy of organization in the human body, which progresses from the most fundamental level of biological organization to more complex structures.

Starting with the smallest component, chemicals refer to atoms and molecules that form the building blocks of life, such as proteins, lipids, carbohydrates, and nucleic acids. These chemicals combine to form cells, which are the basic unit of life and encapsulate the necessary machinery to maintain life functions.

As cells group together, they form tissues, which are collections of similar cells working together to perform a specific function—such as muscle tissue or nervous tissue. Finally, when different types of tissues come together, they create organs, such as the heart or liver, each performing distinct, vital functions within the body.

This sequential arrangement underscores how complex structures build upon simpler ones, reflecting the systematic organization of biological systems. Understanding this hierarchy is essential for anyone studying human anatomy and physiology, as it provides a fundamental framework for learning about the body’s functions and interactions.