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.
The atomic number is the number that indicates the number of protons (or electrons) of an element. The atomic mass is on account of the mass of proton and nutron of an atom. The mass of nutron , proton and electrons are 1.67493*10^-(27) 1.67262*10^(-27) kg and 9.10939*10^(-31) kg. The mass of the electron is negligible compared to that of nutron anor proton. The nutron is slightly more mass than that of proton.