Question

The human pulmonary system is often classified into HAR (upper), TBR (middle), and GER (deep) regions. The effect of PM depends on the size of particles. A. Which section in pulmonary system is mostly affected by 20 micrometer particle. B. Which section in human pulmonary system is mostly affected by 10 nm particles. Rationale your answer.

Answer 1

Parlicles having an aerodynamic diameter of greater than 10 MM will get deposited in nasopharyngeal region (upper af rway passages - nose, nasal cavity and throat). It is due to high aix speed and many turns in the nasopharyngeal aix way. Changes in air flow causes partides to hit the wall of air passage and the particles will get settled in this region. Smaller particles with aerodynamic diameter of about 0.1-5 MM are deposited in tracheobronchial and alveolar regions. At this point the method is sedimentation because the air has slowed enough and the particles get settle out. Inside the alveolar region, the air is more calm. Particles that are having a size less than 0.5 Mm gets into these region