Question

which structure provides the greatest resistance in the normal airway?
guess my favorite...
a trachea
b main bronchi
c segmental bronchi
d medium - sized bronchi

Explanation:

Airway resistance follows principles where medium-sized bronchi (not the largest or smallest airways) create the greatest resistance in normal airways. Larger airways like trachea and main bronchi have low resistance due to their wide diameter, while smallest airways have cumulative low resistance due to high total cross-sectional area. Medium-sized bronchi balance diameter and total cross-section to have the highest individual and overall resistance.

Answer:

D. medium-sized bronchi