Which Main Tissue Type of the Circulatory System Regulates Airflow

Question

Which main tissue type of the circulatory system regulates airflow to alveoli?
A) connective
B) epithelial
C) muscle
D) nervous
E) vascular

Accepted Answer

The muscle tissue type of the circulatory system, specifically the smooth muscle in the bronchioles, regulates airflow to the alveoli.