What type of receptors are located predominantly in the lung tissue?

What type of receptors are located predominantly in the lung tissue?

• A. Alpha-1 receptors
• B. Beta-2 receptors
• C. Dopaminergic receptors
• D. Muscarinic receptors

Answer: (B)

Beta-2 receptors are primarily found in the smooth muscle of the bronchial tree in the lungs. When activated by catecholamines such as epinephrine, these receptors cause smooth muscle relaxation, leading to bronchodilation. This physiological response is crucial during situations such as asthma or respiratory distress, where increased airflow is needed. Additionally, beta-2 receptors contribute to the modulation of other respiratory functions, making them significant for medications that treat respiratory conditions. For instance, beta-2 agonists are commonly used as bronchodilators in the management of asthma and chronic obstructive pulmonary disease (COPD). Their activation can improve respiratory function by widening the air passages, which is vital for effective ventilation.

Beta-2 receptors are primarily found in the smooth muscle of the bronchial tree in the lungs. When activated by catecholamines such as epinephrine, these receptors cause smooth muscle relaxation, leading to bronchodilation. This physiological response is crucial during situations such as asthma or respiratory distress, where increased airflow is needed.

Additionally, beta-2 receptors contribute to the modulation of other respiratory functions, making them significant for medications that treat respiratory conditions. For instance, beta-2 agonists are commonly used as bronchodilators in the management of asthma and chronic obstructive pulmonary disease (COPD). Their activation can improve respiratory function by widening the air passages, which is vital for effective ventilation.