Final answer:
A bronchodilator is a drug used to treat asthma by dilating the bronchi, increasing the air volume in the lungs, and is considered essential for individuals with breathing difficulties.
Step-by-step explanation:
Bronchodilators and Treatment of Asthma
A bronchodilator is a type of drug that can be used to treat conditions such as asthma by opening the airways wider. This action helps in the dilation of the bronchi of the lungs, increasing the volume of air that the lungs can hold. It is interesting to note that a bronchodilator is considered nonessential in some contexts, but for individuals with asthma or other respiratory conditions that constrict air flow, a bronchodilator can be critical for immediate relief and to prevent or control symptoms. The sympathetic nervous system releases certain substances in response to stress or exertion, which also have a bronchodilator effect. This effect is valuable in creating an easier breathing experience for those affected by airway constrictions.