Questions: Why do symptoms of asthma increase during exercise?

The answer to Question 30 is the last one: Exercise requires inhalation through the mouth to increase the volume of air exchanged.

Explanation for each option:

1. During exercise sweat increases humidity on air upon inhalation: This is incorrect. Sweat does not significantly affect the humidity of the air inhaled. The primary concern with asthma during exercise is not related to humidity changes caused by sweat.

2. Air spends more time in the nasal cavity during exercise: This is incorrect. During exercise, people often breathe through their mouths to increase airflow, which means air spends less time in the nasal cavity, not more.

3. Exercise warms the air consumed faster: While exercise can increase body temperature, the warming of inhaled air is not a primary factor in asthma symptoms. The issue is more about the volume and speed of air intake.

4. Exercise requires inhalation through the mouth to increase the volume of air exchanged: This is correct. During exercise, individuals often breathe through their mouths to take in more air quickly. This can lead to inhaling cooler, drier air, which can trigger asthma symptoms as it bypasses the nasal passages that typically warm and humidify the air.

In summary, the increase in asthma symptoms during exercise is primarily due to the need to breathe through the mouth, which allows for a greater volume of air to be exchanged but can also lead to inhaling air that is cooler and drier, potentially triggering asthma symptoms.