I believe the smallest are the alveoli (air sacs), since there are millions of them in the lungs.
The smallest tube in the lungs is the Bronchus
The smallest particles in a compound are electrons.
They can get into your lungs.
The smallest particles of matter are called atoms. Atoms are composed of protons, neutrons, and electrons.
The smallest particles in soil are clay particles. Clay particles are smaller than sand and silt particles, with diameters less than 0.002 mm.
In the atom the electron is the smallest.
Of the three basic particles that atoms are made of, the electron is the smallest.
The smallest particles of matter are called atoms.
The names of the particles that make up soil from the smallest to the largest particles are clay, silt, and sand.
clay has the smallest particles
An atom is the smallest particle of a substance.
the alvioli