What does the pulmonary system primarily involve?

The pulmonary system primarily involves the intake of oxygen and the expulsion of carbon dioxide. This system is crucial for respiration, where air enters the lungs, oxygen is exchanged for carbon dioxide in the alveoli, and the carbon dioxide is then expelled from the body. This process is essential for maintaining the body’s oxygen levels and removing waste gases, enabling cellular metabolism and overall healthy functioning of the body.

The pulmonary system does not focus on the distribution of blood, which is primarily the role of the cardiovascular system. Hormonal control over bodily functions is managed by the endocrine system, and the transmission of nerve signals is a function of the nervous system. Therefore, option B accurately reflects the core responsibilities of the pulmonary system, emphasizing its central role in gas exchange and respiratory function.