Which factor could contribute to exercise-induced bronchoconstriction?

The contributing factors to exercise-induced bronchoconstriction are multifaceted, and each option presented plays a role in triggering this condition.

Weather changes can significantly impact respiratory health; for example, cold, dry air can lead to airway constriction during physical activity. This is particularly common in individuals with asthma, as their airways are more reactive to sudden changes in temperature and humidity.

Low humidity is another critical factor because dry air can irritate the airways and lead to increased bronchoconstriction during exercise. When humidity levels are low, breathing dry air may cause the airways to dry out and react by tightening, making it more difficult to breathe.

High pollen counts can affect individuals with asthma, particularly those who are sensitive to allergens. During exercise, especially in outdoor environments, exposure to pollen can provoke allergic reactions and contribute to inflammation in the airways, resulting in bronchoconstriction.

Because all these factors (weather changes, low humidity, and high pollen counts) can independently trigger bronchoconstriction in individuals with asthma while exercising, acknowledging them collectively is essential. Thus, the option stating that all factors contribute to exercise-induced bronchoconstriction is correct.