What system is responsible for providing oxygen to the blood and removing waste gases?

• A. Nervous system
• B. Endocrine system
• C. Respiratory system
• D. Circulatory system

Answer: (C)

The respiratory system is essential for the process of gas exchange in the body. Its primary function is to facilitate the intake of oxygen from the atmosphere and release carbon dioxide, which is a waste product of metabolism, back into the environment. This process occurs in the lungs, where oxygen diffuses into the blood while carbon dioxide is expelled.

Oxygen is vital for cellular respiration, a process by which cells generate energy. When you inhale, air travels through the airways, reaches the alveoli (tiny air sacs in the lungs), and oxygen passes through the alveolar walls into the capillaries, where it binds to hemoglobin in red blood cells. Simultaneously, carbon dioxide, which has built up in the blood from cellular processes, moves from the blood into the alveoli to be exhaled.

In contrast, the other systems listed serve different functions. The nervous system controls and coordinates body activities but does not directly handle gas exchange. The endocrine system regulates bodily functions through hormones but also does not participate in breathing or gas exchange processes. The circulatory system is responsible for transporting oxygen and nutrients throughout the body and removing waste but relies on the respiratory system to obtain the oxygen and eliminate carbon dioxide. Thus, while the circulatory system works closely