Larynx: Is the hollow muscular organ forming an air passage to the lungs and holding the vocal cords in humans and other mammals, it is also known as the voice box.
Trachea: Also called the windpipe, is a cartilaginous tube that connects the pharynx and larynx to the lungs, allowing the passage of air, and so is present in almost all air-breathing animals with lungs
Bronchi: A bronchus, is a passage of airway in the respiratory system that conducts air into the lungs
Alveoli: any of the many tiny air sacs of the lungs which allow for rapid gaseous exchange.