What type of muscle is typically involved in narrowing the larger airways during bronchospasm?

The correct answer is smooth muscle, as this type of muscle is responsible for controlling involuntary movements within various systems of the body, including the respiratory system. Smooth muscle fibers are found in the walls of the bronchi and bronchioles, where they regulate airway diameter through contraction and relaxation.

During bronchospasm, which is a tightening of the muscles around the airways, the smooth muscle contracts, leading to a narrowing of the larger airways. This narrowing can significantly impact airflow and may result in difficulty breathing, a common feature in conditions like asthma. This involuntary control is vital, as the body can adjust airway resistance automatically in response to various stimuli, such as allergens or irritants.

In contrast, cardiac muscle primarily makes up the heart and is responsible for pumping blood, while skeletal muscle is under voluntary control and is used for moving the body. Striated muscle is a term that generally describes both skeletal and cardiac muscles due to their appearance under a microscope; however, it does not relate to the involuntary movements required for airway control. Thus, the functionality of smooth muscle in the bronchial walls is crucial for regulating airflow and responding to bronchospasm effectively.