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.
Atomic mass is approximately the sum of the number of protons andneutrons found in the nucleus of an atom. Basically atomic mass isthe weight of the neutrons and protons in on â¦ e atom. For elements with no stable isotopes, the mass number of theisotope with the longest half-life is considered the atomic mass ofthe element.