## Medicine

### Respiratory

Question
8 out of 13

A drug is to be delivered by a nebulizer. The size of a droplet for its humidification is : (AIIMS May 2009)

 A < 5μ B 5-10 μ C 10-15μ D 15-20μ

Ans. A

< 5μ

Particles of size <2.5 μ can be carried to the lower airways.

1). Particles with size above 10-15 μ in diameter, because of their settling velocities in air, do not penetrate beyond the upper airways.

2). Particle of size 2.5-10 μ deposit relatively high in the tracheobronchial tree.

3). Particles of size <2.5 μ can be carried to the lower airways.