Which of the following is a characteristic of bronchodilation improved by steroids?

Bronchodilation improved by steroids is characterized primarily by a reduction in airway swelling. Corticosteroids work by exerting an anti-inflammatory effect, which helps to decrease inflammation and swelling in the respiratory tract. This reduction in swelling leads to improved airflow and breathing, making it easier for patients with respiratory conditions, such as asthma or chronic obstructive pulmonary disease (COPD), to breathe effectively.

While systemic steroids can influence various aspects of the immune system, such as a reduction in white blood cell activity, increased white blood cell count is typically associated with inflammatory responses, which corticosteroids aim to suppress. Similarly, enhanced fever response and decreased blood circulation are not directly related to the bronchodilatory effects of steroids. Instead, the correct answer highlights the primary mechanism by which steroids facilitate bronchodilation, targeting inflammation in the airways.