In a healthy person,which of the following will have the greatest influence on resistance to pulmonary airflow?
A) Atmospheric pressure
B) Respiratory rate
C) Bronchiole diameter
D) Quantity of surfactant
E) Contraction of the diaphragm

Question

Quizplus · Accepted Answer

Bronchiole diameter is the most important factor in resistance to pulmonary airflow because it can be easily altered by the contraction or relaxation of the smooth muscles in the bronchioles. The other options listed (atmospheric pressure, respiratory rate, quantity of surfactant, and contraction of the diaphragm) can also affect airflow, but to a lesser extent than bronchiole diameter.

In a Healthy Person,which of the Following Will Have the Greatest