Patient Care Technician (PCT) AAH Practice Exam

Which body system is responsible for providing oxygen to the body?

1. Digestive System

2. Respiratory System

3. Nervous System

4. Circulatory System

The correct answer is: Respiratory System

The respiratory system is crucial for providing oxygen to the body, as it facilitates the exchange of gases in the lungs. When a person inhales, air enters the lungs, where oxygen is absorbed into the bloodstream and carbon dioxide is expelled. This process is vital for maintaining adequate oxygen levels in the body, which are essential for cellular metabolism and overall functioning. The other systems mentioned serve different primary functions. The digestive system is responsible for breaking down food and absorbing nutrients but does not play a direct role in oxygen delivery. The nervous system primarily governs bodily functions through nerve signals and coordination but does not directly supply oxygen. The circulatory system, while it transports oxygen throughout the body, relies on the respiratory system to supply that oxygen in the first place. Thus, while all systems work together to maintain homeostasis, the primary role of providing oxygen is the domain of the respiratory system.