Registered Nurse (RN) Respiratory Practice Exam

Hyperinflation of the lungs refers to an abnormal increase in the amount of air within the lungs, which can often be caused by conditions such as chronic obstructive pulmonary disease (COPD) or asthma. When hyperinflation occurs, excessive air becomes trapped in the alveoli and leads to an expansion of the lung tissue. This expansion impacts the position of the diaphragm, a muscle that plays a crucial role in respiration.

As the lungs become hyperinflated, they push the diaphragm downward into a flatter position instead of allowing it to dome upward during expiration. This flattening reduces the efficiency of the diaphragm, impairing the normal mechanics of breathing. A flattened diaphragm is less effective at creating negative pressure required for inhalation, which can exacerbate breathing difficulties. Thus, the relationship between hyperinflation and diaphragm flattening is physiologically accurate, making the statement true.