Which airway lacks cartilage and is dominated by smooth muscle?

Study for the CAMLPR Histology Practice Test. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

Which airway lacks cartilage and is dominated by smooth muscle?

In the airway tree, cartilage support fades as you move to the smaller passages, and smooth muscle becomes the main wall component. Bronchioles lack cartilage and are dominated by smooth muscle, which lets the diameter of these airways be actively regulated to control airflow and resistance. This contrasts with the trachea and larger bronchi that retain cartilage to stay open, while alveoli are gas-exchange sacs rather than airways. The smooth muscle–rich bronchioles explain why they are a major site of airway resistance and targets for bronchodilation in conditions like asthma.

In the airway tree, cartilage support fades as you move to the smaller passages, and smooth muscle becomes the main wall component. Bronchioles lack cartilage and are dominated by smooth muscle, which lets the diameter of these airways be actively regulated to control airflow and resistance. This contrasts with the trachea and larger bronchi that retain cartilage to stay open, while alveoli are gas-exchange sacs rather than airways. The smooth muscle–rich bronchioles explain why they are a major site of airway resistance and targets for bronchodilation in conditions like asthma.

More practice questions