What biological factor can impact the severity of asthma in individuals?

Airway hyperreactivity is indeed a significant biological factor that can impact the severity of asthma in individuals. This condition refers to the sensitivity of the airways to various stimuli, such as allergens, irritants, and changes in weather. When airways are hyperreactive, they can constrict more easily and significantly in response to triggers, leading to increased asthma symptoms, such as wheezing, shortness of breath, and coughing.

In people with asthma, this hyperreactivity means that their airways are more likely to respond excessively to triggers, which can worsen the condition and lead to more severe asthma attacks. Understanding airway hyperreactivity helps in managing asthma effectively by identifying triggers and enabling the development of personalized asthma management plans aimed at minimizing exposure and improving control.

The other options, while they can influence certain aspects of asthma management or overall health, do not have the same direct biological impact on the severity of the disease. Individual lung capacity may vary and contribute to overall respiratory function but doesn't necessarily correlate with the frequency or intensity of asthma episodes. Body weight and level of physical activity can affect overall health and possibly influence some aspects of asthma, such as control and risk of exacerbations, but they are not intrinsic biological features that directly impact airway function