<prompt> Small airways have laminar air flow because:Reynolds number 2000Very small diameterExtremely low velocityLow cross sectional area  <response>: Small airway have low reynold number, large cross sectional area, large diameter and air flows at a very low velocity. Ref: Physiology of respiration By Michael P. Hlastala, Albe J. Berger, Page 52; Review of Medical Physiology by William ganong, 22nd ednpage 583 