The trachea.
Your nose and throat serve as a passageway, you inhale through your nose and your throat (or trachea) transports food to your stomach and air to your lungs
Trachea
enables air to get to the lungs a passageway.
from nose through airway in throat into lungs
The main function of the pharynx is to provide a passageway for the respiratory and digestive tracts. The pharynx is also referred to as the throat. It houses the tonsils, the uvula, epiglottis and is the entrance way to the esophagus. The pharynx or throat, allows common passageway for air into your lungs and food into your stomach. The pharynx has two roles. The upper part of the pharynx will only allow food to pass through, and the lower part of the pharynx allows air, fluids, and food to pass through.
If the trachea "stopped working" you would die. It's the passageway for oxygen-rich air to get in to your lungs and deoxygenated air to leave the lungs....
air sacs are in the lungs and when you breathe in blood carries it to the lungs.
Pharynx-Air and food pass through the pharynx or throat on their way to the lungs and stomach, respectively. Two small masses of lymphatic tissue called tonsils are embedded in the mucous membrane of the pharynx.
You cannot get frostbite on your lungs -- your nose and throat warms inhaled air, while circulating blood warms the lungs.
The bronchi is the main passageway into the lungs. When taking a breath the air goes into the larynx. Then it goes through the trachea that carries air to the left and right bronchus.
Human takes in air to our lungs.
The bronchial tubes serve as a passageway for air between the external environment (through the nose or mouth) and the lungs.