Like the cardiovascular system, what is the primary determinant of resistance to flow in the respiratory system? Like the cardiovascular system, what is the primary determinant of resistance to flow in the respiratory system? Tube length Tube radius Air viscosity Air density

Radius of the tube or tube radius

Explanation:

Radius of the tub is the major determinant of flow – radius laminar flow has been investigated extensively by scientists, one of the scientist, called Poiseuille, has defined the relationship between driving pressure. This applies to the relationship of gas flow in the long straight smooth tubes under stable conditions - hardly conditions that apply to the lungs

Tube radius

Explanation:

Airway resistance is the opposition to the flow of air through the respiratory tract caused by the forces of friction. The tube radius is a primary determinant of resistance to flow in respiratory system such that a small change in radius can lead to significant changes.

For example, if the radius of the tube doubles, the resistance decreases significantly.