Final answer:
The respiratory system is made up of the respiratory system, lung tissue, and lung cells in order of increasing complexity.
Step-by-step explanation:
The respiratory system consists of various levels of organization that work together to facilitate the exchange of gases in the body. These levels, in order of increasing complexity, are:
- Respiratory system: The entire organ system responsible for bringing oxygen into the body and releasing carbon dioxide and other waste gases into the atmosphere.
- Lung tissue: The specific tissue within the lungs that is responsible for gas exchange.
- Lung cell: The individual cells within the lung tissue that are involved in gas exchange.
So, the correct order of increasing complexity is respiratory system, lung tissue, and lung cell.