The trachea, bronchi and bronchioles form the tracheobronchial tree â a system of airways that allow passage of air into the lungs, where gas exchange occurs.he trachea marks the beginning of the tracheobronchial tree. It arises at the lower border of cricoid cartilage in the neck, as a continuation of the larynx. By Bibi Saint-Pol [CC BY-SA 3.0], via Wikimedia Commons. Fig 1.0 â Overview of the tracheobronchial tree.
While relative masses are nice if you want to compare protons, neutrons and electrons to one another, it doesn't tell you what the actual masses of these particles are. In kilograms, the masses are: Neutron = 1.6749286*10-27 kg.
Hydrogen has an atomic mass of 1.01 atomic mass units. An atomic mass unitis TINY. One gram is equal to about 600000000000000000000000 amu (or 6followed by 23 zeros). So, because the mass of hydrogen is close to 1 amu,1 gram of hydrogen contains about that same huge number of atoms.