Colorado Esthetician Written Practice Exam 2025 – Complete Test Prep

The system that enables breathing is the respiratory system. This system is primarily responsible for delivering oxygen to the blood and removing carbon dioxide from it, facilitating the critical gas exchange that occurs in the lungs. The respiratory system includes organs such as the nose, trachea, bronchi, and lungs, working together to ensure that air is inhaled and exhaled effectively.

While other systems, such as the muscular system, play a supportive role by allowing the diaphragm and intercostal muscles to expand and contract the chest cavity during breathing, they do not solely enable the act of respiration. The nervous system does control the respiratory rate and can influence the muscular contractions involved in breathing, but it does not directly perform the functions of gas exchange. The lymphatic/immune system is involved in fluid balance and defense against pathogens but is not related to the process of breathing. Understanding the specific roles of each system helps clarify why the respiratory system is the correct choice for enabling the act of breathing.