Lectures on respiratory physiologyLectures on respiratory physiology

Mechanics of Breathing IIMechanics of Breathing II

Patterns of gas flow in tubes

Poiseuille equation for laminar flow

Patterns of gas flow in tubes

The Reynolds number

Pressures during the breathing cycle

Number of airways increases rapidly with generation

Most resistance is in the medium sized airways

Airway resistance falls with increasing lung volume

Flow – volume curves

Isovolume pressure-flow curves

Mechanism of dynamic compression

Flow – volume curves

Flow through collapsible tubes

Mechanism of dynamic compression

Work done on the lung during breathing