The elasticity of the respiratory system tends to decrease with age due to changes in the connective tissue components, including elastic fibers. This loss of elasticity can lead to a reduction in the efficiency of the alveoli in expanding and contracting during breathing, impacting gas exchange. Reduced elasticity also contributes to the closure of smaller airways and alveoli, particularly during exhalation, leading to a decrease in lung capacity and ventilation efficiency. These age-related changes can increase the work of breathing and reduce the overall effectiveness of the respiratory system in oxygenating the blood and removing carbon dioxide.

The respiratory system can partially compensate for the loss of ciliated cell function, primarily through increased mucus production by goblet cells and mucous glands. When cilia are damaged or destroyed, the body's response is often to produce more mucus as a means to trap and remove inhaled particles and pathogens. However, this increased mucus production can lead to congestion and difficulty in clearing the airways, potentially exacerbating respiratory conditions. Therefore, while there is a compensatory mechanism, it is not entirely effective in maintaining respiratory health in the absence of functioning ciliated cells.

Continuous exposure to irritants, such as pollutants or allergens, can lead to chronic changes in goblet cells and mucous glands. These changes include hyperplasia (an increase in the number of cells) and hypertrophy (an increase in cell size) of goblet cells, leading to excessive mucus production. This overproduction can contribute to airway obstruction and impaired lung function, as seen in chronic respiratory diseases like chronic obstructive pulmonary disease (COPD) and asthma. Additionally, prolonged irritation can cause the mucous glands to undergo structural changes, affecting their function and the composition of the mucus they produce.

Respiratory infections can indirectly impact the structural integrity of cartilage and smooth muscle in the airways. Inflammation caused by infections can lead to swelling and narrowing of the airways, placing additional strain on the smooth muscle and cartilage. Over time, this can result in the remodelling of these structures, potentially weakening the cartilage and altering smooth muscle function. In chronic or severe cases, such as in chronic bronchitis or severe pneumonia, the cartilage may become damaged or deformed, and smooth muscle may undergo hypertrophy or hyperplasia, leading to permanent changes in airway structure and function.

Air pollution and smoking have detrimental effects on ciliated cells in the respiratory tract. These factors can lead to the destruction or impairment of cilia, reducing their ability to effectively move mucus and trapped particles out of the lungs. This impairment can result in an accumulation of mucus and debris in the airways, increasing the risk of respiratory infections and conditions like chronic bronchitis. Additionally, harmful substances in smoke or polluted air can cause inflammation and damage to the respiratory epithelium, further compromising the function of ciliated cells.