The human body is organized into several levels, each with its own specific functions and structures. These levels of organization include:

1. Chemical level: This is the most basic level of organization, where atoms combine to form molecules. These molecules, such as proteins, carbohydrates, and lipids, are the building blocks of cells.

2. Cellular level: Cells are the basic structural and functional units of the human body. They are specialized to perform specific functions and can vary in size, shape, and function. Examples of cells include muscle cells, nerve cells, and blood cells.

3. Tissue level: Tissues are groups of similar cells that work together to perform a specific function. There are four main types of tissues in the human body: epithelial tissue (covers and protects body surfaces), connective tissue (supports and connects body parts), muscle tissue (contracts to produce movement), and nervous tissue (transmits electrical signals).

4. Organ level: Organs are composed of two or more different types of tissues that work together to perform specific functions. Examples of organs include the heart, lungs, liver, and brain.

5. Organ system level: Organ systems are groups of organs that work together to perform a specific function. There are 11 major organ systems in the human body, including the circulatory system, respiratory system, digestive system, nervous system, and skeletal system.

6. Organism level: This is the highest level of organization, where all the organ systems work together to maintain the overall health and functioning of the human body. At this level, the body is considered a complete living organism.