Because of their smooth muscle content,_____________ are the primary determinants of air flow.
A)trachea
B)bronchi
C)alveoli
D)bronchioles

Question

Quizplus · Accepted Answer

Bronchioles, being the smallest airways, are primarily composed of smooth muscle fibers, which allow them to dynamically regulate airway resistance and thus determine airflow. Trachea and bronchi have cartilage and connective tissue structures that provide support but have limited smooth muscle content. Alveoli are small sacs where gas exchange occurs and do not have a role in determining air flow.

Because of Their Smooth Muscle Content,_____________ Are the Primary Determinants