Field Internship Student Data Acquisition Project. (FISDAP) Airway Practice Exam

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What is the main effect of Beta-2 receptor activation?

Decreased heart contractility
Vasoconstriction
Bronchodilation
Increased skeletal muscle contraction

The correct answer is: Bronchodilation

Beta-2 receptor activation is primarily associated with bronchodilation, which is the widening of the air passages in the lungs. This effect occurs because the stimulation of Beta-2 adrenergic receptors leads to relaxation of the smooth muscles surrounding the bronchi and bronchioles, thereby allowing for easier airflow. This mechanism is particularly important in conditions such as asthma or chronic obstructive pulmonary disease (COPD), where airway constriction can cause difficulty in breathing. Other physiological effects of Beta-2 receptor activation can include increased glycogenolysis and gluconeogenesis in the liver, which can aid in energy production during stress responses. Overall, the primary and most notable effect in the context of airway management is the bronchodilation that facilitates better oxygen exchange.